High School - Gateway 3

The materials reviewed for Imagine IM AGA meet expectations for providing teacher guidance with useful annotations and suggestions for how to enact the student materials and ancillary materials, with specific attention to engaging students in order to guide their mathematical development.

The Teacher Course Guide (Flipbook) contains sections titled What’s in an Imagine IM Lesson, Key Structures in This Course, and Scope and Sequence. Within the Scope and Sequence, there are Pacing Guides and a Dependency Chart. The sections within the Teacher Course Guide (Flipbook) provide instructional guidance related to the use of student and ancillary materials. 

Examples include:

• The Teacher Course Guide (Flipbook), Scope and Sequence, lists each of the units, explains connections to prior learning, and describes the progression of learning throughout each unit.

• The Teacher Course Guide (Flipbook), Scope and Sequence, Pacing Guides, and Dependency Diagrams show the interconnectedness among lessons and units within the series (Algebra 1, Geometry, Algebra 2), as well as how the series connects to Grades 6-8.

• The Teacher Course Guide (Flipbook), What’s in an Imagine IM Lesson, Narratives Tell The Story states, “The story of each grade is told across the units in the narratives. Each unit has a narrative that describes the mathematical work that will unfold in that unit. Each section within a unit has a narrative that describes the mathematical work in the section. Each lesson and each activity in a unit also has narratives. The Lesson Narrative explains: The mathematical content of the lesson and its place in the learning sequence. The meaning of any new terms introduced in the lesson. How the mathematical practices come into play, as appropriate. The Activity Narrative explains: The mathematical purpose of the activity and its place in the learning sequence. What students are doing during the activity. What to look for, while students are working on an activity, to orchestrate an effective Activity Synthesis. Connections to the mathematical practices, when appropriate.”

• The Teacher Course Guide (Flipbook), Key Structures in This Course, Principles of Imagine IM Curriculum Design, Coherent Progression states, “Each unit starts with an invitation to the mathematics. The first few lessons provide an entry point for all students and offer the opportunity to observe students’ prior understandings. Most lessons start with a Warm-up to activate students’ prior knowledge and to set up the work of the day. This is followed by instructional activities in which students are introduced to new concepts, procedures, contexts, or representations, or make connections between them. The Lesson Synthesis at the end consolidates understanding and makes the learning goals of the lesson explicit. In the Cool-down that follows, students apply what they learned. Each activity starts with a Launch that gives all students access to the task. Independent work time follows, allowing them to grapple with problems individually before working in small groups. In the Activity Synthesis at the end, students consolidate their learning by making connections between their work and the mathematical goals. Each activity includes carefully chosen contexts and numbers that support the coherent sequence of learning goals in the lesson.” 

• The Teacher Course Guide (Flipbook), Key Structures in This Course, Using the 5 Practices For Orchestrating Productive Discussions states, "Promoting productive and meaningful conversations between students and teachers is essential to success in a problem-based classroom. To facilitate these conversations, the Imagine IM curriculum incorporates the framework presented in 5 Practices for Orchestrating Productive Mathematical Discussions (Smith & Stein, 2011). The 5 Practices are: anticipate, monitor, select, sequence, and make connections between students’ responses. All Imagine IM lessons support the practices of anticipating, monitoring, and selecting students’ work to share during whole-group discussions. In lessons in which students make connections between representations, strategies, concepts, and procedures, the Lesson Narrative and the Activity Narrative support the practices of sequencing and connecting as well, and the lesson is tagged so that these opportunities are easily identifiable. For additional opportunities to connect students’ work, look for activities tagged with MLR7 Compare and Connect. Similar to the 5 Practices routine, Compare and Connect supports the practices of monitoring, selecting, and making connections. In curriculum workshops and PLCs, rehearse and reflect on enacting the 5 Practices."

• The Course Glossary provides a visual glossary for teachers that includes both definitions and illustrations. 

The materials include annotations and suggestions that are presented within the context of specific learning objectives. Within each lesson or activity, implementation guidance includes a rationale for each strategy or activity. Presentation slides are available for each lesson. The slides reproduce lesson content and provide visual support for student engagement. They also include teacher notes from the Lesson Narrative, Activity Narrative, Launch, and Activity Synthesis.

Examples include:

• Algebra 1, Unit 3, Lesson 2, Warm-up, Activity Narrative states, “The purpose of this Warm-up is to elicit the idea that two-way tables can be used to think about relative frequency, which will be useful when students create relative frequency tables in a later activity. While students may notice and wonder many things about these images, the ways in which the values in the two-way tables relate to the totals are the important discussion points.”

• Algebra 1, Unit 2, Unit Narrative states, “In this unit, students examine solving and graphing linear equations and systems of linear equations. The unit builds on learning from middle school when students used variables to write equations, manipulated equations using valid moves such as the distributive property, and solved basic systems of linear equations using graphs and substitution. In the first section, students recall writing equations to represent situations. In the second section, they use valid moves to write equivalent equations that can be used to solve for unknown values or to isolate variables. The third section examines solving systems of equations using graphs, substitution for variables, and elimination of variables. Students use their understanding of writing equivalent equations to understand why each of the methods works for finding the solution.”

• Geometry, Unit 3, Lesson 4, Activity 1, Activity Synthesis states, “The goal of the synthesis is for students to understand the connection between the process of dilating points on a line and dilating the line itself. Specifically, what happens if the line goes through the center of the dilation? Invite students to share how the definition of dilation can help them answer these questions. Students should have the opportunity to hear and articulate that because dilations, by definition, take points along rays through the center, then dilating a line through the center will take all the points to points on that same line, so the line doesn’t move. It may be hard for students to put into words that the points are dilated, but due to the nature of infinity, the line is not changed, so invite several students to put their explanation into their own words. In a later activity, students will state and record a theorem about lines that do and do not pass through the center of the dilation, so it’s useful for students to be clear about why this is true.” 

• Algebra 2, Unit 3, Lesson 7, Activity 2, Activity Narrative states, “The purpose of this activity is for students to practice solving rational equations and identifying extraneous solutions, if they exist. Students are expected to use algebraic methods to solve the equations and should be discouraged from using graphing technology.” The Launch provides additional teacher guidance and states, “Arrange students in groups of 2. Tell students to complete the first problem individually and then check their work with their partner before completing the following problems together.”

The materials reviewed for Imagine IM AGA meet expectations for containing explanations and examples of grade-level/course-level concepts and/or standards and how the concepts and/or standards align to other grade/course levels so that teachers can improve their own knowledge of the subject.

The materials contain adult-level explanations and examples of the more complex course-level concepts so that teachers can improve their own knowledge of the subject. At the unit level, the materials identify vertical alignment. Standards addressed in the lesson are listed as “Building On,” “Addressing,” and “Building Towards.” Unit Narratives, Lesson Narratives, and Activity Synthesis sections throughout the materials provide explanations and examples of how course-level concepts connect to prior grade-level and course-level content and support progression to subsequent units and courses.

Examples include:

• Algebra 1, Unit 3, Lesson 1, Warm-up, Activity Synthesis clarifies the meaning of variables and categorical variables by directing teachers to “Point out that a variable is a characteristic that can take on different values and a categorical variable represents data which can be divided into groups or categories.” An example follows, and question prompts are provided for the teacher. Materials state, “Ask students: ‘Why is this table an effective method for solving this question?’ (It is effective because it keeps track of all the information we know and don’t know in a way that is organized to show the relationship between each piece of information.) ‘Was using a table the only way to solve the questions?’ (No, there are other methods to arrive at a good solution. Reasoning from the original statements, drawing a representation of the situation, or other similar methods are also good ways to approach the problem.) ‘What does the word ‘two’ in a two-way table refer to? How is it seen in the example from the task?’ (It refers to the number of categorical variables, not the number of categories for each variable. In this example, the two variables are writing utensil preference and paper preference.) Summarize by stating: ‘A two-way table can be used to organize data from two different categorical variables.’”

• Geometry, Unit 4, Unit Narrative states, “In this unit students build an understanding of ratios in right triangles, which leads to naming cosine, sine, and tangent as trigonometric ratios. Prior to beginning this unit, students will have considerable familiarity with right triangles and similarity. They learned to identify right triangles in grade 4. Students studied the Pythagorean Theorem in grade 8, and used similar right triangles to build the idea of slope. This unit builds on this extensive experience and grounds trigonometric ratios in familiar contexts. Several concepts build throughout the unit. Students begin by using similar triangles to create a table of ratios of the side lengths in right triangles. At first, their table includes only the bottom rows of the table shown here. Taking the time to both build and use the table helps students construct a solid foundation before they learn the names of trigonometric ratios.” An example of the sine, cosine, and tangent ratio for a 25^\circ and 65^\circ degree angle are provided. The Unit Narrative goes on to state, “Students notice patterns between the columns for cosine and sine before they first hear the terms ‘cosine’ and ‘sine.’ In a subsequent lesson they investigate that relationship, proving the two ratios are equal for complementary angles. Finding the measures of acute angles in a right triangle follows a similar arc, where students first use the table to estimate and then in a subsequent lesson learn how to calculate an angle measure given the side measures by using arcsine, arccosine, and arctangent. As students measure side lengths and compute ratios, there is an opportunity to discuss precision. In this unit, students will round side lengths to the nearest tenth and angle measures to the nearest degree in most cases. When students solve problems in context they grapple with whether or not their answer is reasonable, as well as the appropriate degree of precision to report. Students will continue to use and add to their reference charts. The completed reference chart for this unit is provided for teacher reference.”

• Algebra 2, Unit 1, Lesson 2, About This Lesson states, “The purpose of this lesson is for students to understand what makes a sequence geometric and to begin to connect that idea with their learning about exponential functions in an earlier course. A geometric sequence is a function in which the terms of the sequence grow by the same factor from one term to the next. For example, in the geometric sequence 0.5, 2, 8, 32, 128, . . . , each term is 4 times the previous term. Two ways to think about how you know the sequence is geometric are: 

  • Each term is multiplied by a factor of 4 to get the next term.

  • The ratio of each term and the previous term is 4.

We call 4 the growth factor or the common ratio. Students begin the lesson articulating what they notice and wonder (MP6) about examples of geometric sequences. Next, they develop two different sequences from the context of repeatedly cutting a piece of paper in half. Students use tables and graphs to identify the growth factor and define these geometric sequences. Lastly, students practice calculating missing terms of geometric sequences, using repeated reasoning (MP8) to make sense of the sequence and calculate the growth factor. In an earlier course, students encountered the idea of functions and studied exponential functions specifically. Some students may see that a geometric sequence is simply an exponential function whose outputs are the terms and whose inputs are the positions of the terms. The Lesson Synthesis invites students to recall those ideas with a light touch by referring to, for example, ‘the size of each piece as a function of the number of cuts’ and by using the term ‘growth factor’ rather than ‘common ratio.’ Students will have more opportunities in future lessons to make connections to exponential functions.”

The materials contain adult-level explanations and examples of concepts beyond the current course so that teachers can improve their own knowledge of the subject. The Teacher Course Guide (Flipbook) includes a “Further Reading” section that connects mathematical research and pedagogy to course content. Articles extend teacher content knowledge beyond grade-level expectations and clarify mathematical concepts in greater depth. The For Districts and Schools page (linked at the bottom of the homepage) includes a Solutions, Professional Learning section that provides information about professional development.

Examples include:

• Algebra 1, Teacher Course Guide (Flipbook), Further Reading, Unit 2, Extraneous and Lost Roots states, “In this essay…McCallum characterizes solving an equation as applying a function to each side of the equation, and the conditions that result in extraneous roots.”

• Geometry, Teacher Course Guide (Flipbook), Further Reading, Unit 4, Making Sense of Distance in the Coordinate Plane states, “In this post, Richard shows how the distance formula is connected to an equation of a circle, which is the topic of a later unit in this course.”

• Algebra 2, Teacher Course Guide (Flipbook), Further Reading, Different Uses of Letters and Types of Representations in Algebra states, “In this essay…Oehrtman and Shultz explore the uses of letters (variables, constants, parameters) in high school mathematics and beyond.”

The materials reviewed for Imagine IM AGA meet expectations for including a year-long scope and sequence with standards correlation information.

The Teacher Course Guide (Flipbook) includes multiple components that support planning and understanding of the program’s structure and standards alignment. The Scope and Sequence section narratively outlines unit content, prior knowledge, future learning, and terminology. Lessons by Standard provides a table that shows each content standard for the course and the lessons in which it appears. Standards by Lesson provides a table listing the standards covered within each lesson. Teacher Course Guide (Flipbook) Standards for Mathematical Practice aligns math practice standards (MPs) to lessons. The Pacing Guide and Dependency Diagram outline the number of lessons and suggested instructional days for each unit. Each unit also includes a Unit at a Glance document, accessible from Unit Materials. The Unit at a Glance identifies the standards addressed in each lesson and categorizes them as "Building On," "Addressing," or "Building Toward."

Examples:

• Algebra 1, Teacher Course Guide (Flipbook), Scope and Sequence narratively outlines unit content, prior knowledge, future learning, and terminology. The Teacher Course Guide (Flipbook) states, “Students begin the course with one-variable statistics. Data collection and analysis set a tone for the course, of understanding quantities in context, and allows students to access grade-level mathematics with less dependence on prior skills than other topics. Gathering and displaying data, measuring data distribution, and interpreting statistical results encourages students to collaborate, communicate, and explore new tools and routines. They study linear equations, and systems of linear equations, by modeling relationships in various situations. Students write, evaluate, graph, and solve equations, explaining and validating their reasoning with increased precision. These insights lead into a unit on two-variable statistics in which students examine relationships between variables, using two-way tables, scatter plots, and linear models. From there, they move on to solving and graphing linear inequalities and systems of linear inequalities to represent constraints in situations. Students deepen their understanding of functions by representing, interpreting, and communicating about them, using function notation, domain and range, average rate of change, and features of graphs. They also see categories of functions, starting with linear functions (including their inverses) and piecewise-defined functions (including absolute-value functions), followed by exponential and quadratic functions. For each function type, students investigate real-world contexts, look closely at the structural attributes of the function, and analyze how these attributes are expressed in different representations. The course ends with a close look at quadratic equations. Through reasoning, writing equivalent equations, and applying the quadratic formula, students extend their ability to use equations to model relationships and solve problems. Along the way, students encounter rational and irrational solutions, deepening their understanding of the real-number system. Within the classroom activities, students have opportunities to engage in aspects of mathematical modeling. Additionally, modeling prompts are provided for use throughout the course, offering opportunities for students to engage in the full modeling cycle. Implement these in a variety of ways. Please see the Mathematics Modeling Prompts section of this Course Guide for a more detailed explanation.”

• Algebra 1, Teacher Course Guide (Flipbook), Standards by Lesson, Unit 7, Lesson 3 identifies A-SSE.1, F-BF.1a, and F-IF.2.

• Algebra 1, Teacher Course Guide (Flipbook), Standards for Mathematical Practice, identifies MP1 in Unit 6, Lessons 3, 9, and 24.

• Algebra 1, Teacher Course Guide (Flipbook), Lessons by Standard, A-REI.7 is identified in Unit 8, Lesson 24.

• Algebra 1, Unit 5, Unit Materials, Unit at a Glance, Unit 5, Lesson 9 identifies Building Toward standards A-REI.11 and Addressing standards A-REI.11, F-IF.4, F-IF.6.

• Algebra 1, Unit 3, Lesson 4, Alignments, identifies Building On standards 8.SP.1, S-ID.6, Addressing standards S-ID.6, S-ID.6a, S-ID.7, and Building Toward standards S-ID.6c, S-ID.7.

• Geometry, Teacher Course Guide (Flipbook), Scope and Sequence narratively outlines unit content, prior knowledge, future learning, and terminology. The Teacher Course Guide (Flipbook) states, “For the first several units, students practice making conjectures and observations. This begins with work on compass and straightedge constructions. Students gradually build up to writing formal proofs in narrative form, engaging in a cycle of conjecture, rough draft, peer feedback, and final draft. To support their proof writing, students record definitions, theorems, and assertions in a reference chart, which will be used and expanded throughout the course. Students build on their middle school study of transformations of figures. Using transformation-based definitions of congruence and similarity allows students to rigorously prove the triangle congruence and similarity theorems. Students apply these theorems to prove results about quadrilaterals, isosceles triangles, and other figures. Students extend their understanding of similarity to right triangle trigonometry in this course and to periodic functions in future courses. Next, students derive volume formulas and study the effect of dilation on both area and volume. They use coordinate geometry to connect ideas from algebra and geometry: Students review theorems, skills, and functions from prior units and reconsider them, using the structure of the coordinate plane. Students use transformations and the Pythagorean Theorem to build equations of circles, parabolas, parallel lines, and perpendicular lines from definitions, and students link transformations to the concept of functions. Nearing the end of the course, students analyze relationships between segments and angles in circles and develop the concept of radian measure for angles, which will be built upon in subsequent courses. Students close the year by extending what they learned about probability in grade 7 to consider probabilities of combined events and to identify when events are independent. Modeling prompts are provided for use throughout the course. While students have opportunities to engage in aspects of mathematical modeling during class activities, modeling prompts allow students to engage in the full modeling cycle. Modeling prompts can be implemented in various ways. Please see the Mathematics Modeling Prompts section of this Course Guide for a more detailed explanation.”

• Geometry, Teacher Course Guide (Flipbook), Standards by Lesson, Unit 4, Lesson 9 identifies A-CED.4 and F-TF.8.

• Geometry, Teacher Course Guide (Flipbook), Standards for Mathematical Practice, identifies MP7 in Unit 4, Lessons 2, 3, 5, and 11.

• Geometry, Teacher Course Guide (Flipbook), Lessons by Standard, G-CO.7 is identified in Unit 2, Lesson 3.

• Geometry, Unit 5, Unit Materials, Unit at a Glance, Unit 5, Lesson 1 identifies Building Toward standards G-GMD.4 and Addressing standards G-GMD.4, G-MG.1.

• Geometry, Unit 2, Lesson 1, Alignments, identifies Building On standards 8.G.1, 8.G.1b, Addressing standards G-CO.5, G-CO.6, and Building Toward standards G-CO.7, G-CO.11.

• Algebra 2, Teacher Course Guide (Flipbook), Scope and Sequence narratively outlines unit content, prior knowledge, future learning, and terminology. The Teacher Course Guide (Flipbook) states, “Students begin the course with a study of sequences, which is also an opportunity to revisit linear and exponential functions. Students represent functions in a variety of ways while addressing some aspects of mathematical modeling. This work leads students to analyze situations that are well modeled by polynomials before pivoting to study the structure of polynomial graphs and equations. Students do arithmetic on polynomials and rational functions and use different forms to identify asymptotes and end behavior. Students also study polynomial identities and use some key identities to establish the formula for the sum of the first n terms of a geometric sequence. Next, students extend exponent rules to include rational exponents. Students solve equations involving square and cube roots before developing the idea of i, a number whose square is -1. The number i expands the number system to include complex numbers and allows students to solve quadratic equations with non-real solutions. Building on rational exponents, students return to their study of exponential functions and establish that the property of growth by equal factors over equal intervals holds even when the interval has non-integer length. Students use logarithms to solve for unknown exponents, and are introduced to the number e and its use in modeling continuous growth. Logarithm functions and some situations they model well are also briefly addressed. Students learn to transform functions graphically and algebraically. In previous courses and units, students adjusted the parameters of particular types of models to fit data. In this course, students consolidate and generalize this understanding. This work is useful in the study of periodic functions that comes next. Students work with the unit circle to make sense of trigonometric functions, and then students use trigonometric functions to model periodic relationships. The last unit, on statistical inference, focuses on analyzing experimental data modeled by normal distributions. Students learn to use sampling and simulations to account for variability in data and estimate population mean, margin of error, and proportions. Students develop skepticism about news stories that summarize data inappropriately. Modeling prompts are provided for use throughout the course. While students have opportunities to engage in aspects of mathematical modeling during class activities, modeling prompts allow students to engage in the full modeling cycle. Modeling prompts can be implemented in various ways. Please see the Mathematics Modeling Prompts section of this Course Guide for a more detailed explanation.”

• Algebra 2, Teacher Course Guide (Flipbook), Standards by Lesson, Unit 6, Lesson 8 identifies F-BF.3, F-IF.7c, and S-ID.6a.

• Algebra 2, Teacher Course Guide (Flipbook), Standards for Mathematical Practice, identifies MP2 in Unit 8, Lessons 1, 6, 10, 13, and 15.

• Algebra 2, Teacher Course Guide (Flipbook), Lessons by Standard, A-APR.1 is identified in Unit 2, Lessons 2, 4, and 6. 

• Algebra 2, Unit 5, Unit Materials, Unit at a Glance, Unit 5, Lesson 2 identifies Addressing standards A-SSE.1, F-LE.2, F-LE.5 and Building On standards F-IF.4.

• Algebra 2, Unit 3, Lesson 2, Alignments, identifies Building On standards A-CED.4, Addressing standards A-CED.2, F-IF.2, F-IF.4, F-IF.C, F-IF.7, and Building Toward standards A-CED.2, F-BF.3, F-IF.4.

The materials reviewed for Imagine IM AGA meet expectations for explaining the program’s instructional approaches, identifying research-based strategies, and explaining the role of the standards.

Examples include:

• Teacher Course Guide (Flipbook), Problem-Based Teaching and Learning states, “Illustrative Mathematics is a problem-based curriculum that fosters the development of mathematics learning communities in classrooms, gives students access to the mathematics through a coherent progression, and provides teachers the opportunity to deepen their knowledge of mathematics, students’ thinking, and their own teaching practice. The curriculum and the professional-learning materials are designed to support students’ and teachers’ learning. This document defines the principles that guide Imagine IM’s approach to mathematics teaching and learning. It then outlines how each component of the curriculum supports teaching and learning, based on these principles.”

• Teacher Course Guide (Flipbook), Problem-Based Teaching and Learning, Learning Mathematics by Doing Mathematics states, “‘Students learn mathematics as a result of solving problems. Mathematical ideas are the outcomes of the problem-solving experience rather than the elements that must be taught before problem solving’ (Hiebert et al., 1996). A problem-based instructional framework supports teachers in structuring lessons so students are the problem solvers learning the mathematics.”

• Teacher Course Guide (Flipbook), Key Structures in This Course, Principles of Imagine IM Curriculum Design, Coherent Progression states, “The basic architecture of the materials supports all learners through a coherent progression of the mathematics, based both on the standards and on research-based learning trajectories. Activities and lessons are parts of a mathematical story that spans units and grade levels. This coherence allows students to view mathematics as a connected set of ideas that makes sense.”

• Teacher Course Guide (Flipbook), What’s in an Imagine IM Lesson, Instructional Routines, describes Instructional Routines (IRs) as, “designs for interaction that invite all students to engage in the mathematics of each lesson.” The materials describe IRs as structured opportunities for students to connect personal experience and mathematical understanding through discussion, questioning, justification, and reasoning. The materials state that IRs, “have a predictable structure and flow,” and are intended to provide consistent support for both teachers and students. The curriculum uses a finite set of routines across lessons to support pacing, reduce repeated explanation of directions, and increase time spent on mathematical learning. Some IRs, identified as Mathematical Language Routines (MLRs), were developed by the Stanford University UL/SCALE team. MLRs are integrated into lessons either as embedded components or as optional supports for English Learners. The first instance of each routine includes detailed guidance for implementation, while subsequent instances offer abbreviated reminders. The materials also include Digital Routines (DRs), which identify required or suggested uses of technology. These routines are flagged within activities to support lesson planning and professional development.

The materials reviewed for Imagine IM AGA meet expectations for providing a comprehensive list of supplies needed to support instructional activities. 

The Teacher Course Guide (Flipbook) includes a comprehensive Required Materials list for all grade-level content. The Unit at a Glance, located in the Unit Materials section of each unit, provides a table listing the required materials for each lesson. The table identifies Materials to Gather (or states "none" when no materials are required) and Materials to Copy (or states "none" when no copying is required). In addition, the Required Preparation section of each lesson lists the required materials and preparation for specific activities.

Examples include:

• Algebra 1, Teacher Course Guide (Flipbook), lists the following as required materials: “A collection of balls that bounce, Blank paper, Chart paper, Colored pencils, Four-function calculators, Glue or glue sticks, Graphing technology, Graph paper, Internet-enabled device, Math Community Chart, Measuring tapes, Rulers, Scientific calculators, Scissors, Spreadsheet technology, Statistical technology, Sticky notes, and Tools for creating a visual display.”

• Geometry, Unit 7, Unit at a Glance, Lesson 4, Materials to Gather states, “Geometry toolkits (HS): Activity 1, Activity 3, Colored pencils: Activity 2, Scientific calculators: Activity 2.”

• Algebra 2, Unit 7, Unit at a Glance, Lesson 3, Materials to Gather states, “Circular objects of different sizes: Activity 3, Ribbon or string: Activity 3.” 

The materials reviewed for Imagine IM AGA meet expectations for providing consistent opportunities to determine student learning throughout the school year. The assessment system provides sufficient teacher guidance for evaluating student performance and determining instructional next steps.

The assessment system provides multiple opportunities throughout the course to determine student learning throughout the school year. This includes:

• Every unit begins with a Check Your Readiness diagnostic assessment. 

• Most lessons end with a Cool-down formative assessment. 

• Each section ends with a Checkpoint of 1-3 problems that assess learning goals. 

• Each unit ends with an End-of-Unit Assessment. 

• Longer units have a Mid-Unit Assessment.

The Teacher Course Guide (Flipbook), Assessment Guidance states, "Assessment guidance focuses on what can be clearly observed and uses asset-based language to focus on what students understand about particular math concepts and what they show they can do as it relates to procedural skills, fluency, and application…The guidance also encourages reliance on the coherence of the math in the curriculum when considering how to address any unfinished learning.” 

The materials provide assessment guidance at the lesson, section, and unit levels throughout the course. Each End-of-Unit Assessment and the Mid-Unit Assessment includes answer keys and standards alignment to support teachers in interpreting student understanding. According to the Teacher Course Guide (Flipbook) and Assessment Guidance, “All summative assessment problems include a complete solution and standards alignment. Multiple-choice and multiple-response problems often include a reason for each potential error that a student might make. Restricted constructed-response and extended-response items include a rubric. Unlike formative assessments, problems on summative assessments generally do not prescribe a method of solution.”

Examples Include:

• Algebra 1, Unit 4, End-of-Unit Assessment, students graph a linear inequality. Problem 4 states, “Graph the solution to the inequality 4x+5y<20.” Problem 4 Narrative states, “Students may graph the equation 4x+5y<20 either by plotting points (likely by finding the intercepts), or by rearranging the equation into slope-intercept form. Take note of their method for graphing the equation as well as the point that they test to see which side of the line to shade. It is also possible for students to decide which side of the line to shade without testing a point: Since the coefficients of x and y are positive and 4x+5x must be less than a positive number, the side containing (0,0) must contain the solutions.” Answer Key scoring guidance states, “Minimal Tier 1 response: Work is complete and correct. Sample: See graph. Tier 2 response: Work shows good conceptual understanding and mastery, with either minor errors or correct work with insufficient explanation or justification. Sample errors: A boundary line that is solid rather than dashed; one mistake related to graphing the line, such as an algebra error on the way to y=mx+b form, or a line drawn with positive slope (provided that the decision about which side to shade after testing a point is consistent with this previous work); the wrong side of a correctly-drawn line is shaded. Tier 3 response: Significant errors in work demonstrate lack of conceptual understanding or mastery. Sample errors: No shading at all; no line is graphed; two or more Tier 2 error types.” 

• Geometry, Unit 4, End-of-Unit Assessment, students identify trigonometric ratios for a right triangle. Problem 2 states, “Select all of the true equations based on the figure. A. cos(42)=\frac{b}{c} B. cos(48)=\frac{b}{c} C. sin(42)=\frac{b}{c} D. sin(48)=\frac{b}{c} E. tan(42)=\frac{b}{a} F. tan(48)=\frac{a}{b}“ The task includes an image of triangle \triangle ABC with angle A labeled 48^\circ and corresponding sides, a, b, c. Problem 2 Narrative states, “A student who does not select choice B or choice F may be confused about the roles that the hypotenuse, adjacent side, and opposite side play in determining trigonometric ratios. Students who do not select choice C or choice E may not recognize 42 degrees as the complement of 48 degrees. A student may select choice D if they mistake sine and cosine. A student may select choice A if they are not paying attention to the angle.”

• Algebra 2, Unit 5, Mid-Unit Assessment, students interpret a graph showing exponential decay. Problem 7 states, “The graph shows the amount of a certain chemical m, in milliliters (mL), left in a tank of water h hours after a filter begins running. The amount of the chemical decreases exponentially. a. By what factor did the chemical decrease in the first hour and a half? Explain how you know. b. By what factor did the chemical decrease in the first half hour? What about in the first hour? Explain how you know. c. Write an equation relating m, the number of milliliters of the chemical in the tank of water, and h, the number of hours since the filtering began.” The task includes a graph of m,(mL chemical in tank) on the y-axis and h, (hours since filtering began) on the x-axis. Problem 7 Narrative states, “Students interpret a graph showing exponential decay. They find, by extracting a root, the hourly decay rate given two values that are 1.5 hours apart. They use the hourly decay rate to write an equation representing the situation.” Answer Key scoring guidance states, “Minimal Tier 1 response: Work is complete and correct, with complete explanation or justification. Sample responses: a. \frac{8}{27} (or equivalent) because \frac{80}{27}=\frac{8}{27}. b. \sqrt[3]{27} (or equivalent) for the first half hour and \sqrt[3]{\frac{8}{27}}^2 for the first hour because there are 3 half hours in an hour and half, and there are 2 half hours in an hour. c. m=270\cdot(\frac{4}{9})^h (or equivalent). Tier 2 response: Work shows good conceptual understanding and mastery, with either minor errors or correct work with insufficient explanation or justification. Sample errors: Correct answers to parts a and b, but uses the half hourly rate instead of the hourly rate in the equation for part c; miscalculates answer for part a, but uses this correctly in parts b and c; incorrect answer to part b based on correct work for part a, and correct work for part c based on answer to part b. Tier 3 response: Work shows a developing but incomplete conceptual understanding, with significant errors. Sample errors: Incorrect answers to parts a and b; answer to part b is not justified or incorrectly justified; equation in part c, in addition to part a or b, is incorrect. Tier 4 response: Work includes major errors or omissions that demonstrate a lack of conceptual understanding and mastery. Sample errors: Answers to parts a and c are incorrect, and part b is not justified or incorrectly justified.”

Materials also provide teachers with structured guidance following formative assessments. Check Your Readiness serves as a pre-unit diagnostic formative assessment that identifies students who need additional support with prerequisite skills and highlights topics to address during the unit. Assessment Guidance highlights certain lessons and/or activities to slow down and spend extra time to ensure student understanding of the mathematical concepts. Most lessons conclude with Cool-downs that assess student thinking in relation to the lesson’s learning goal. At the conclusion of lesson sections within a unit, Checkpoints include one to three problems that assess section learning goals. According to the Teacher Course Guide (Flipbook), Assessment Guidance, assessment guidance for Cool-downs and Checkpoints falls into three categories with suggestions for next steps if most students struggle: “More Chances” which signals students will revisit the concept without altering instruction; “Points to Emphasize,” which recommends minor instructional adjustments; and “Press Pause,” which suggests more time is needed before advancing. 

Examples include:

• Algebra 1, Unit 6, Check Your Readiness, students interpret features of a discrete graph and make sense of statements given in function notation in terms of a real-life situation. Problem 9 states, “The function g represents the temperature in a city, in degrees Fahrenheit, h hours after 8:00 a.m. The graph plots some values of g. (The task includes a graph of a function g with “temperature in F^\circ” on the y-axis and “hours after 8 a.m.” on the x-axis.) Select all statements that must be true about the situation. A. g(0)=50; b. g(12) represents the temperature at noon; C. The maximum temperature shown on the graph happens at 3:00 p.m.; D. g(11)<g(8); E. The temperature increased about 10 degrees Fahrenheit between 8:00 am and 1:00 p.m.” Problem 9 Narrative states, “The content assessed in this problem is first encountered in Lesson 9: Interpreting Exponential Functions. Students interpret features of a discrete graph and make sense of statements given in function notation in terms of the situations they represent. Students may select B if they do not read carefully that the x-axis shows hours after 8:00 a.m. rather than hours on the clock. This same error could lead them to disregard A, C, D, or E. If most students struggle with this item, use Lesson 9 Activity 2 to show that f(9) represents an output and, because this is a function of time f(t), then t is the input. It is important to help students interpret correctly that t is ‘time since 1977,’ very similar to this item (time since 8 a.m.).”

• Geometry, Unit 3, Lesson 8, Cool-down, students prove theorems about triangles and other figures using similarity. The Cool-down states, "Noah has a conjecture about rhombi with certain properties always being similar. 1. What would you need to do to show that the conjecture is incorrect? 2. What would you need to do to show that the conjecture is true?” Responding to Student Thinking states, “Press Pause: By this point in the unit, there should be some student mastery of sufficient and necessary conditions for similarity. If most students struggle, make time to revisit related work in the practice problems referred to here (links to Geometry, Unit 3, Lesson 8, Practice Problem 3 and Geometry, Unit 3, Lesson 17, Practice Problem 9 are provided).”

• Algebra 2, Unit 2, Section A Checkpoint, students explain that the sum of two polynomials is a polynomial. Problem 2 states, “Two polynomial expressions are added together to get x+4x^2-3+7x^3. Is the sum a polynomial? Explain your reasoning.” Responding to Student Thinking states, “Points to Emphasize: If most students struggle with the definition of a polynomial, focus on this as opportunities arise in the next several lessons. For example, in the Synthesis of the activity (Algebra 2, Unit 2, Lesson 5, Warm-up), ask students whether these are polynomial functions and to explain how they know.”

The materials reviewed for Imagine IM AGA meet expectations for providing strategies and support for students in special populations to work with grade-level content and meet or exceed grade-level standards, which support their regular and active participation in learning. 

The Teacher Course Guide (Flipbook) includes overarching guidance on strategies and accommodations for special populations in Universal Design for Learning and Access for Students with Diverse Abilities.

Examples include:

• Teacher Course Guide (Flipbook), Universal Design for Learning and Access for Students with Diverse Abilities, Access for Students with Diverse Abilities states, “Supplemental instructional strategies, labeled Access for Students with Diverse Abilities, are included in each lesson. They are designed to help meet the individual needs of a diverse group of learners. Each support is aligned to one of the three principles of Universal Design for Learning, to provide multiple means of engagement, representation, or action and expression, and includes a suggested strategy to increase access and eliminate barriers. Use these lesson-specific supports, as needed, to help students succeed with a specific activity, without reducing the mathematical demands of the task. Phase them out as students gain understanding and fluency.”

• Teacher Course Guide (Flipbook), Universal Design for Learning and Access for Students with Diverse Abilities, Accessibility for Students with Visual Impairments states, “For students with visual impairments, accessibility features are built into the materials: 1. A palette of colors distinguishable to people with the most common types of color blindness. 2. Tasks and problems are designed so that success does not depend on the ability to distinguish between colors. 3. Mathematical diagrams, presented in scalable vector graphics (SVG) format, can be magnified, without loss of resolution, and rendered in Braille. 4. Where possible, text associated with images is not part of the image file, but rather included as an image caption accessible to screen readers. 5. Alt text on all images makes interpretation easier for users accessing the materials with a screen reader. If students with visual impairments are accessing the materials using a screen reader, it is important to understand: All images in the curriculum have alt text: a very short indication of the image’s contents, so that the screen reader doesn’t skip over as if nothing is there. Some images have a longer description to help a student with a visual impairment recreate the image in their mind. Understand that students with visual impairments likely will need help accessing images in lesson activities and assessments. Prepare appropriate accommodations. Accessibility experts, who reviewed this curriculum, recommended that eligible students have access to a Braille version of the curriculum materials, because a verbal description of many of the complex mathematical diagrams is inadequate for supporting their learning.”

Examples include:

• Algebra 1, Unit 6, Lesson 7, Activity 1, Access for Students with Diverse Abilities states, “Representation: Internalize Comprehension. Activate or supply background knowledge. Provide a timeline next to the tables, and have students select a starting point year for zero and then label the years correlated with the positive exponents prior to labeling years associated with negative exponents. Supports accessibility for: Memory, Organization.”

• Geometry, Unit 1, Lesson 19, Activity 2, Access for Students with Diverse Abilities states, “Representation: Internalize Comprehension. Use color coding and annotations to highlight connections between representations in a problem. For example, color code pairs of congruent angles and corresponding variables or expressions. Supports accessibility for: Visual-Spatial Processing.”

• Algebra 2, Unit 6, Lesson 5, Activity 1, Access for Students with Diverse Abilities states, “Engagement: Develop Effort and Persistence. Chunk this task into more manageable parts. Give students a subset of the cards to start with and introduce the remaining cards once students have completed their initial set of matches. Supports accessibility for: Conceptual Processing, Organization, Memory.”

The materials reviewed for Imagine IM AGA meet expectations for regularly providing extensions and/or opportunities for advanced students to engage with grade-level mathematics at greater depth. 

Are You Ready for More? Activities available in some lessons offer extension opportunities for advanced students to engage with course content at a higher level. Teacher Course Guide (Flipbook), Key Structures in This Course, Are You Ready For More?, states, “Select classroom activities offer differentiation for students ready for a greater challenge…Every extension problem is made available to all students, with the heading Are You Ready for More? These problems go deeper into grade-level mathematics and often make connections between the topic at hand and other concepts. Some problems extend the work of the associated activity, while others involve work from prior grades, prior units in the course, or reflect work that is related to the K–12 curriculum but is a type of problem not required by the standards. The problems are not routine or procedural, and they are not just ‘the same thing again but with harder numbers.’ They are intended for use on an opt-in basis by students—if they finish the main class activity early or want to do more mathematics on their own. It is not expected that an entire class engages in Are You Ready for More? problems, and it is not expected that any single student works on all of them.” 

Building on Student Thinking guidance embedded in the Teacher Guide provides teachers with ways to deepen student understanding as they engage with course materials. Teacher Course Guide (Flipbook), Key Structures in This Course, Teacher Learning through Curriculum, Building on Student Thinking states, “Certain activities within each lesson plan include ways to provide guidance, based on students’ understandings and ideas. Building on Student Thinking offers look-fors and questions to support students as they engage in an activity…Building on Student Thinking section provides questions that advance students’ understanding of mathematical concepts, strategies, or connections between representations.”

Throughout the series, there are many lessons and/or activities that the materials identify as optional. The materials do not indicate that advanced students are required to complete additional assignments beyond those assigned to their classmates.

Modeling Prompts available in each course include tasks that allow students to engage in grade-level mathematics at varying levels of depth. The materials provide multiple entry points while maintaining grade-level expectations.

Examples include:

• Algebra 1, Unit 5, Lesson 5, Activity 1, students use rules to evaluate functions, interpret the input and output values within the context of the price for two different video game consoles, and solve for an unknown input value. Building on Student Thinking states, “Students may question if A is a function at all because unlike B or other function rules they have seen so far, A(x) is defined with a constant instead of an expression containing the dependent variable. Or they may wonder why A(x) has the same value no matter what the input value is. Ask students to recall the definition of function and to consider whether each input value gives only one output value. Because it does, even though it is always the same output value, A is still a function.” Are You Ready for More? states, “Describe an option that, for any amount of time used, would cost no more than one of the given options and no less than the other given option. Explain or show how you know this option would meet these requirements.”

• Geometry, Mathematical Modeling Prompts, Modeling Prompt #2: The Garden Wall, students determine the cost of building a wall around a raised garden bed. The materials provide three Student Task Statement options with varying degrees of scaffolding and open-endedness. Task Statement 1, Student-Facing Statement states, “A homeowner is building the raised-bed garden shown in the plan. A new concrete block wall will connect to an existing garden wall, and the space in between will be filled with soil to grow plants. The homeowner is doing all the work and buying all the materials. How much does the homeowner spend to make the garden?“ Task Statement 2, Student-Facing Statement states, “A homeowner is building the raised-bed garden shown in the plan. A new concrete block wall will connect to an existing garden wall by stacking concrete blocks, without mortar, and the walled space will be filled with garden soil. The concrete blocks have dimensions 8 inches by 8 inches by 16 inches. The wall will be topped by capstones with dimensions 8 inches by 2 inches by 16 inches. The homeowner is doing all the work and buying all the materials. What is the cost of the materials?” Task Statement 3, Student-Facing Statement states, “A homeowner is building the raised-bed garden shown in the plan. A new concrete block wall will connect to an existing garden wall by stacking concrete blocks, without mortar, and the walled space will be filled with garden soil. The concrete blocks have dimensions 8 inches by 8 inches by 16 inches. The wall will be topped by capstones with dimensions 8 inches by 2 inches by 16 inches. Concrete blocks cost $1.50 each. Capstones $1.00 each. Garden soil costs $36 per cubic yard. The homeowner is doing all the work and buying all the materials. What is the cost of the materials?”

• Algebra 2, Unit 6, Lesson 14 is identified as optional and focuses on applying principles of transformations to circles in the coordinate plane. Lesson Narrative, Learning Goal states, “Rewrite an equation of a circle by completing the square to identify the transformations to the circle.”

The materials reviewed for Imagine IM AGA meet expectations for providing manipulatives, both virtual and physical, that are accurate representations of the mathematical objects they represent and, when appropriate, are connected to written methods.

Teacher Course Guide (Flipbook), Key Structures in This Course, Principles of the Imagine IM Curriculum Design, Purposeful Representations states, “Several considerations guide the choice of representations, the timing of their introduction, and the sequence in which they are presented, such as the extent to which they: Serve the mathematical learning goals; help to build conceptual understanding; support a coherent progression of mathematical ideas; are relevant across cases and contexts. The principle of ‘concrete before abstract’ also guides the use of representations. This principle comes into play in two ways: First, more concrete representations are introduced before those that are more abstract. For example, to develop an understanding of ratios, students first use physical objects to represent quantities related by a ratio. Next, they create discrete diagrams to represent such quantities, followed by double-number-line diagrams and tables of equivalent ratios. This thinking eventually bridges into representing non-proportional linear relationships and the multiple ways to represent functions that start in Imagine IM Grade 8 and continue throughout high school. Each representation is less concrete, more abstract, and offers greater flexibility and efficiency than the one before it. Second, a representation can show concrete concepts and numbers in earlier courses, and abstract ideas and quantities in later courses. For example, starting in Imagine IM Grade 3, students use rectangular diagrams to represent the multiplication of whole numbers. In Imagine IM Grade 6, they use such diagrams to represent the product of multi-digit decimals. In these early uses, students relate the discrete factors and product to concrete attributes of the rectangle: its side lengths and area. Later, students use rectangles to represent the multiplication of expressions that include variables, such as 5\cdot(3x+8) and a(2b+c). The same diagram is now used in a more abstract sense: to represent and organize decomposable factors and their partial products. In high school, students use the same diagram to reason about the multiplication and division of binomials and higher-degree polynomials.”

The Teacher Course Guide (Flipbook), Required Materials section, the Unit at a Glance documents, and the Teaching Notes of each lesson list suggested manipulatives. For Geometry, the materials recommend that students have access to a geometry toolkit that includes index cards or straightedges, compasses, tracing paper, blank paper, colored pencils, and scissors. Teacher Course Guide (Flipbook), Required Materials states, “Examples of graphing technology are a handheld graphing calculator, a computer with a graphing calculator application installed, and an internet-enabled device with access to a site like desmos.com/calculator. For students using the digital materials, a separate graphing calculator tool isn’t necessary - interactive applets are embedded throughout, and a graphing calculator tool is accessible on the student digital toolkit page.” The Tools menu, located in the navigation bar at the bottom left of some digital lessons, provides access to virtual manipulatives, including a four-function calculator, scientific calculator, graphing calculator, geometry tool, spreadsheet tool, probability calculator, and constructions tool.

Examples include:

• Algebra 1, Unit 7, Lessons 8 and 9 build on students’ use of the area model to represent the distributive property and multiply binomials. Lesson 8 Warm-up states, “1. Explain why the diagram shows that 6(3+4)=6\cdot3+6\cdot4. 2. Draw a diagram to show that 5(x+2)=5x+10.” The task includes an image of a rectangle partitioned into two smaller rectangles. Students use the area model to represent multiplication of polynomials. Lesson 9, Activity 1, Problem 1 states, “Show that (x-1)(x-1) and x^2-2x+1 are equivalent expressions by drawing a diagram or applying the distributive property. Show your reasoning.”

• Geometry, Unit 1, Lesson 5, Activity 1, students use a straightedge and compass to construct a line perpendicular to a given line through a point on the line. Activity Narrative states, “This activity invites students to play with straightedge and compass moves to construct a line perpendicular to a given line through a point on the given line. Making dynamic geometry software available gives students an opportunity to choose appropriate tools strategically.” Students have the option to complete the construction on paper or using the provided digital applet embedded in the digital lesson. Activity 1 states, “Here is a line l with a point labeled C. Use straightedge and compass moves to construct a line perpendicular to l that goes through C.” 

• Algebra 2, Unit 2, Lesson 1, Activity 1, students use scissors and paper to construct a box and write expressions representing its volume. Activity Narrative states, “This activity offers a hands-on introduction to the mathematical work of modeling the volume of a box using a polynomial function. Students do not need to develop an equation with variables for the volume of the box or identify the greatest possible volume at this time, as that is the focus of the following activity.” Launch states, “Demonstrate how to construct a box from an 8.5-inch by 11-inch sheet of paper by cutting out identical squares, with a side length of 1 inch, from each corner. Then measure to fill in the length, width, and height columns of the table. Calculate the volume of the box and add a point, to the displayed axes, that represents the relationship between the side length of the cutout square and the volume of the box. Assign each group a side length between 0.5 inch and 4 inches, in half-inch increments. Adjust these side lengths as needed if using different-sized paper. Tell groups to construct a box by cutting squares out of each corner using their assigned side length, and then to add a point to the graph representing their box.”