Contents

1. Section A: Add and Subtract within 1,000 without Composition or Decomposition
2. Lesson 1: Compare, Count on, and Count Back
   1. Warm-up: Number Talk: Count Back
   2. 1.1: Notice the Difference
   3. 1.2: What’s the Big Difference?
3. Lesson 2: Add and Subtract with Tens and Hundreds
   1. Warm-up: Number Talk: Add Multiples of 10
   2. 2.1: Show It with Base-ten Blocks
   3. 2.2: How Many with Base-ten Blocks and Equations
4. Lesson 3: Count on or Count Back to Subtract
   1. Warm-up: Number Talk: Tens and Hundreds
   2. 3.1: Jump Back, Back, Back
   3. 3.2: Who Spilled Paint?
5. Lesson 4: Add and Subtract Three-digit Numbers in Different Ways
   1. Warm-up: Number Talk: Count Back by Place
   2. 4.1: Zero Tens and Zero Ones
   3. 4.2: Add or Subtract with Expanded Form
   4. Section A Summary
6. Lesson 5: Center Day 1
   1. Warm-up: How Many Do You See: Hundreds, Tens, and Ones
   2. 5.2: Centers: Choice Time
   3. Section A Practice Problems
7. Section B: Add within 1,000 using Place Value Strategies
8. Lesson 6: Use a Ten to Add Within 1,000
   1. Warm-up: Number Talk: Numbers that Make 10
   2. 6.1: Add Two-digit and Three-digit Numbers
   3. 6.2: Card Sort: Perfect Ten
9. Lesson 7: Compose a Larger Unit
   1. Warm-up: How Many Do You See: Are They the Same?
   2. 7.1: Compose a Ten or a Hundred
   3. 7.2: Walk About and Add
10. Lesson 8: Compose Tens and Hundreds to Add
    1. Warm-up: How Many Do You See: Too Many Tens
    2. 8.1: Compare the Sums
    3. 8.2: Different Ways to Show Your Thinking
11. Lesson 9: Add Three-digit Numbers
    1. Warm-up: Number Talk: Ten and Some More
    2. 9.1: How Did You Add Three-digit Numbers?
    3. 9.2: Analyze and Add
12. Lesson 10: Add within 1,000
    1. Warm-up: Number Talk: Use Sums to Find Sums
    2. 10.1: Card Sort: Three-digit Sums
    3. 10.2: Find the Unknown Value
    4. Section B Summary
13. Lesson 11: Center Day 2
    1. Warm-up: Number Talk: Make 100
    2. 11.2: Introduce Five in a Row, Add Within 1,000 with Composing
    3. Section B Practice Problems
14. Section C: Subtract within 1,000 using Place Value Strategies
15. Lesson 12: Decompose to Subtract
    1. Warm-up: What Do You Know About 354?
    2. 12.1: Subtract from 354
    3. 12.2: Decompose with Base-ten Blocks
16. Lesson 13: Decompose Tens or Hundreds
    1. Warm-up: Which One Doesn’t Belong: Blocks and Blocks
    2. 13.1: Subtract with Base-ten Diagrams
    3. 13.2: Decompose a Ten or Hundred
17. Lesson 14: Think Before You Subtract
    1. Warm-up: Which One Doesn’t Belong: Blocks and Blocks and Blocks
    2. 14.1: Agree to Disagree
    3. 14.2: Sort and Subtract
18. Lesson 15: Decompose a Ten and a Hundred to Subtract
    1. 15.1: Elena’s Thinking
    2. 15.2: Walk About and Subtract
19. Lesson 16: Subtract Within 1,000
    1. Warm-up: True or False: Equations Based on Place Value
    2. 16.1: Jada’s Thinking
    3. 16.2: Find It Your Way
    4. Section C Summary
20. Lesson 17: Center Day 3
    1. Warm-up: Number Talk: Simplify It
    2. 17.2: More Target Numbers and Choice Time
21. Lesson 18: Paint Splattered Bar Graph
    1. Warm-up: Number Talk: Subtract within 1,000
    2. 18.1: Student Population
    3. 18.2: Asked and Answered
    4. Section C Practice Problems
22. Glossary
23. Attributions
24. Notes
25. Notes