- Section A: Add and Subtract within 1,000 without Composition or Decomposition
- Warm-up: Number Talk: Count Back
- 1.1: Notice the Difference
- 1.2: What’s the Big Difference?

- Warm-up: Number Talk: Add Multiples of 10
- 2.1: Show It with Base-ten Blocks
- 2.2: How Many with Base-ten Blocks and Equations

- Warm-up: Number Talk: Tens and Hundreds
- 3.1: Jump Back, Back, Back
- 3.2: Who Spilled Paint?

- Warm-up: Number Talk: Count Back by Place
- 4.1: Zero Tens and Zero Ones
- 4.2: Add or Subtract with Expanded Form
- Section A Summary

- Warm-up: How Many Do You See: Hundreds, Tens, and Ones
- 5.2: Centers: Choice Time
- Section A Practice Problems

- Section B: Add within 1,000 using Place Value Strategies
- Warm-up: Number Talk: Numbers that Make 10
- 6.1: Add Two-digit and Three-digit Numbers
- 6.2: Card Sort: Perfect Ten

- Warm-up: How Many Do You See: Are They the Same?
- 7.1: Compose a Ten or a Hundred
- 7.2: Walk About and Add

- Warm-up: How Many Do You See: Too Many Tens
- 8.1: Compare the Sums
- 8.2: Different Ways to Show Your Thinking

- Warm-up: Number Talk: Ten and Some More
- 9.1: How Did You Add Three-digit Numbers?
- 9.2: Analyze and Add

- Warm-up: Number Talk: Use Sums to Find Sums
- 10.1: Card Sort: Three-digit Sums
- 10.2: Find the Unknown Value
- Section B Summary

- Warm-up: Number Talk: Make 100
- 11.2: Introduce Five in a Row, Add Within 1,000 with Composing
- Section B Practice Problems

- Section C: Subtract within 1,000 using Place Value Strategies
- Warm-up: What Do You Know About 354?
- 12.1: Subtract from 354
- 12.2: Decompose with Base-ten Blocks

- Warm-up: Which One Doesn’t Belong: Blocks and Blocks
- 13.1: Subtract with Base-ten Diagrams
- 13.2: Decompose a Ten or Hundred

- Warm-up: Which One Doesn’t Belong: Blocks and Blocks and Blocks
- 14.1: Agree to Disagree
- 14.2: Sort and Subtract

- 15.1: Elena’s Thinking
- 15.2: Walk About and Subtract

- Warm-up: True or False: Equations Based on Place Value
- 16.1: Jada’s Thinking
- 16.2: Find It Your Way
- Section C Summary

- Warm-up: Number Talk: Simplify It
- 17.2: More Target Numbers and Choice Time

- Warm-up: Number Talk: Subtract within 1,000
- 18.1: Student Population
- 18.2: Asked and Answered
- Section C Practice Problems

- Glossary
- Attributions
- Notes
- Notes