# Contents

1. Section A: Add and Subtract
1. Warm-up: Which One Doesn’t Belong: Compare Representations
2. 1.1: Movie Snacks
3. 1.2: Build and Compare
1. 2.1: How Did You Find It?
2. 2.2: You Go This Way, I’ll Go That Way
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
1. Warm-up: Number Talk: Subtract 2 Digits
2. Section A Practice Problems
2. Section B: Decompose to Subtract
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
1. Warm-up: True or False: How many Tens? How many Ones?
2. 6.1: Different Ways to Decompose
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
1. Warm-up: Number Talk: Multiples of 10
2. 8.1: Aren’t You Missing Something?
3. 8.2: Different Ways to Decompose
1. Warm-up: Which One Doesn’t Belong: Tens and Ones
2. 9.1: Sort and Find the Value
4. Section B Summary
1. Warm-up: Notice and Wonder: Compare the Representations
2. 10.2: Centers: Choice Time
3. Section B Practice Problems
3. Section C: Represent and 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
1. Warm-up: Notice and Wonder: Mancala
2. 12.1: Interpret the Diagram
3. 12.2: Card Sort: Story Problems and Diagrams
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
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
1. Warm-up: Number Talk: Subtract Multiples of 10
2. 15.2: Centers: Choice Time
1. Warm-up: Notice and Wonder: The Shopping Cart
2. 16.1: 100 Items