Contents

1. Section A: Add and Subtract
2. Lesson 1: Add and Subtract to Compare
   1. Warm-up: Which One Doesn’t Belong: Compare Representations
   2. 1.1: Movie Snacks
   3. 1.2: Build and Compare
3. Lesson 2: Find the Unknown Addend
   1. 2.1: How Did You Find It?
   2. 2.2: You Go This Way, I’ll Go That Way
4. Lesson 3: Add or Subtract to Solve Story Problems
   1. Warm-up: How Many Do You See: Base-ten Diagram
   2. 3.1: Fun at the Zoo
   3. 3.2: More Fun at the Zoo
   4. Section A Summary
5. Lesson 4: Center Day 1
   1. Warm-up: Number Talk: Subtract 2 Digits
   2. Section A Practice Problems
6. Section B: Decompose to Subtract
7. Lesson 5: Subtract Your Way
   1. Warm-up: Number Talk: Subtract a Little More
   2. 5.1: How Do You Find the Value?
   3. 5.2: Subtract with Base-ten Blocks
8. Lesson 6: Compare Methods for Subtraction
   1. Warm-up: True or False: How many Tens? How many Ones?
   2. 6.1: Different Ways to Decompose
9. Lesson 7: Subtract Two Digits
   1. Warm-up: How Many Do You See: Compose a Ten
   2. 7.1: What's the Difference?
   3. 7.2: Use Blocks to Take Away
10. Lesson 8: Different Ways to Decompose
    1. Warm-up: Number Talk: Multiples of 10
    2. 8.1: Aren’t You Missing Something?
    3. 8.2: Different Ways to Decompose
11. Lesson 9: Add and Subtract Within 100
    1. Warm-up: Which One Doesn’t Belong: Tens and Ones
    2. 9.1: Sort and Find the Value
    3. 9.2: Add or Subtract
    4. Section B Summary
12. Lesson 10: Center Day 2
    1. Warm-up: Notice and Wonder: Compare the Representations
    2. 10.2: Centers: Choice Time
    3. Section B Practice Problems
13. Section C: Represent and Solve Story Problems
14. Lesson 11: How Do You Solve Story Problems?
    1. Warm-up: What Do You Know About Story Problems?
    2. 11.1: How Many Seeds?
    3. 11.2: The Seeds of Greatness
15. Lesson 12: Story Problems and Diagrams
    1. Warm-up: Notice and Wonder: Mancala
    2. 12.1: Interpret the Diagram
    3. 12.2: Card Sort: Story Problems and Diagrams
16. Lesson 13: Story Problems and Equations
    1. Warm-up: Which One Doesn’t Belong: Diagrams
    2. 13.1: Card Sort: Story Problems and Equations
    3. 13.2: Represent and Solve Story Problems
17. Lesson 14: Solve It Your Way
    1. Warm-up: Number Talk: Multiple Addends
    2. 14.1: Put It All Together
    3. 14.2: Select, Solve, and Share
    4. Section C Summary
18. Lesson 15: Center Day 3
    1. Warm-up: Number Talk: Subtract Multiples of 10
    2. 15.2: Centers: Choice Time
19. Lesson 16: Our Market’s Inventory
    1. Warm-up: Notice and Wonder: The Shopping Cart
    2. 16.1: 100 Items
    3. 16.2: Buyers and Sellers
    4. 16.3: Sales Reports
    5. Section C Practice Problems
20. Glossary
21. Attributions
22. Citations
23. Notes
24. Notes