- 1.1: Pricing Theater Popcorn
- 1.2: Entrance Fees
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- Lesson 1 Summary
- Lesson 1 Practice Problems

- 2.1: Notice and Wonder: Remembering Tape Diagrams
- 2.2: Every Picture Tells a Story
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- Lesson 2 Summary
- Lesson 2 Practice Problems

- 3.1: Find Equivalent Expressions
- 3.2: Matching Equations to Tape Diagrams
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- Lesson 3 Summary
- Glossary
- Lesson 3 Practice Problems

- 4.1: Algebra Talk: Seeing Structure
- 4.2: Situations and Diagrams
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- Lesson 4 Summary
- Lesson 4 Practice Problems

- 5.1: Algebra Talk: Seeing Structure
- 5.2: More Situations and Diagrams
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- Lesson 5 Summary
- Lesson 5 Practice Problems

- 6.1: Which One Doesn’t Belong: Seeing Structure
- 6.2: Card Sort: Categories of Equations
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- Lesson 6 Summary
- Lesson 6 Practice Problems

- 7.1: Hanger Diagrams
- 7.2: Hanger and Equation Matching
- 7.3: Use Hangers to Understand Equation Solving
- Lesson 7 Summary
- Lesson 7 Practice Problems

- 8.1: Equivalent to 2(x+3)
- 8.2: Either Or
- 8.3: Use Hangers to Understand Equation Solving, Again
- Lesson 8 Summary
- Lesson 8 Practice Problems

- 9.1: Which One Doesn’t Belong: Rational Number Arithmetic
- 9.2: Old and New Ways to Solve
- 9.3: Keeping It True
- Lesson 9 Summary
- Lesson 9 Practice Problems

- 10.1: Algebra Talk: Solve Each Equation
- 10.2: Analyzing Solution Methods
- 10.3: Solution Pathways
- Lesson 10 Summary
- Lesson 10 Practice Problems

- 11.1: Remember Tape Diagrams
- 11.2: At the Fair
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- Lesson 11 Summary
- Lesson 11 Practice Problems

- 12.1: 20% Off
- 12.2: Walking More Each Day
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- Lesson 12 Summary
- Lesson 12 Practice Problems

- 13.1: Is This Enough?
- 13.2: What Does It Look Like?
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- Lesson 13 Summary
- Lesson 13 Practice Problems

- Lesson 1: Relationships between Quantities
- Lesson 2: Reasoning about Contexts with Tape Diagrams
- Lesson 3: Reasoning about Equations with Tape Diagrams
- Lesson 4: Reasoning about Equations and Tape Diagrams (Part 1)
- Lesson 5: Reasoning about Equations and Tape Diagrams (Part 2)
- Lesson 6: Distinguishing between Two Types of Situations
- Lesson 7: Reasoning about Solving Equations (Part 1)
- Lesson 8: Reasoning about Solving Equations (Part 2)
- Lesson 9: Dealing with Negative Numbers
- Lesson 10: Different Options for Solving One Equation
- Lesson 11: Using Equations to Solve Problems
- Lesson 12: Solving Problems about Percent Increase or Decrease
- Lesson 13: Using Equations to Solve for Unknown Angles
- 1.1: Estimate Heights of People
- 1.2: Stories about 9
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- Lesson 1 Summary
- Lesson 1 Practice Problems

- 2.1: Unknowns on a Number Line
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- 2.3: What Number Am I?
- Lesson 2 Summary
- Glossary
- Lesson 2 Practice Problems

- 3.1: True or False: Fractions and Decimals
- 3.2: Basketball Game
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- Lesson 3 Summary
- Lesson 3 Practice Problems

- 4.1: Solutions to Equations and Solutions to Inequalities
- 4.2: Earning Money for Soccer Stuff
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- Lesson 4 Summary
- Lesson 4 Practice Problems

- 5.1: Lots of Negatives
- 5.2: Inequalities with Tables
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- Lesson 5 Summary
- Lesson 5 Practice Problems

- 6.1: Possible Values
- 6.2: Elevator
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- Lesson 6 Summary
- Lesson 6 Practice Problems

- 7.1: Number Talk: Additive Inverses
- 7.2: A Helpful Observation
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- Lesson 7 Summary
- Glossary
- Lesson 7 Practice Problems

- 8.1: Number Talk: Parentheses
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- Lesson 8 Summary
- Glossary
- Lesson 8 Practice Problems

- 9.1: Why is it True?
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- 9.3: Making Sides Equal
- Lesson 9 Summary
- Lesson 9 Practice Problems

- 10.1: True or False?
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- 10.3: Grouping Differently
- Lesson 10 Summary
- Lesson 10 Practice Problems

- 11.1: Are They Equal?
- 11.2: X’s and Y’s
- 11.3: Seeing Structure and Factoring
- Lesson 11 Summary
- Lesson 11 Practice Problems

- 12.1: Matching Hangers
- 12.2: Matching Equation Moves
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- Lesson 12 Summary
- Lesson 12 Practice Problems

- 13.1: Different Equations?
- 13.2: Step by Step by Step by Step
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- 13.4: Trading Moves
- Lesson 13 Summary
- Lesson 13 Practice Problems

- 14.1: Equal Perimeters
- 14.2: Predicting Solutions
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- Lesson 14 Summary
- Lesson 14 Practice Problems

- 15.1: Which One Doesn’t Belong: Equations
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- 15.3: What's the Equation?
- Lesson 15 Summary
- Lesson 15 Practice Problems

- 16.1: Matching Solutions
- 16.2: Thinking About Solutions Some More
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- Lesson 16 Summary
- Glossary
- Lesson 16 Practice Problems

- 17.1: Which Would You Choose?
- 17.2: Water Tanks
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- Lesson 17 Summary
- Lesson 17 Practice Problems

- 18.1: Algebra Talk: Equivalent to 0.75t-21
- 18.2: Two Ways to Calculate
- 18.3: Which Way?

- Lesson 1: Writing and Graphing Inequalities
- Lesson 2: Solutions of Inequalities
- Lesson 3: Interpreting Inequalities
- Lesson 4: Finding Solutions to Inequalities in Context
- Lesson 5: Efficiently Solving Inequalities
- Lesson 6: Modeling with Inequalities
- Lesson 7: Subtraction in Equivalent Expressions
- Lesson 8: Expanding and Factoring
- Lesson 9: Combining Like Terms (Part 1)
- Lesson 10: Combining Like Terms (Part 2)
- Lesson 11: Combining Like Terms (Part 3)
- Lesson 12: Balanced Moves
- Lesson 13: More Balanced Moves
- Lesson 14: Strategic Solving
- Lesson 15: All, Some, or No Solutions
- Lesson 16: How Many Solutions?
- Lesson 17: When Are They the Same?
- Lesson 18: Applications of Expressions

- Glossary
- Attributions
- Notes
- Notes