- Section A: Add and Subtract Within 20
- Warm-up: How Many Do You See: Within 10
- 1.1: Sums I've Got
- 1.2: Centers: Choice Time

- Warm-up: Number Talk: Connect Addition and Subtraction
- 2.1: Cube Tower Addition and Subtraction
- 2.2: Find the Unknown Number
- 2.3: Differences I've Got

- Warm-up: Number Talk: Use Known Sums
- 3.1: Many Ways to Add and Subtract
- 3.2: Heads Up

- Section B: Story Problems
- Warm-up: How Many Do You See: Numbers to 20
- 4.1: Field Trip to the Aquarium
- 4.2: Find the Unknown Number

- Warm-up: True or False: More or Less
- 5.1: At the Planetarium
- 5.2: Which Equations Match?

- Warm-up: Which One Doesnâ€™t Belong: Equations
- 6.1: The School Carnival
- 6.2: How Many Rides?

- Section C: Numbers to 120
- Warm-up: What Do You Know About 103?
- 7.2: Count and Represent
- 7.3: How Many Cats?

- Warm-up: Estimation Exploration: Tens and Ones
- 8.3: Centers: Choice Time

- Warm-up: True or False: Comparison Statements
- 9.1: A Number Riddle
- 9.2: More Number Riddles

- Warm-up: True or False: Add within 100
- 10.1: Write Number Riddles
- 10.2: Solve Our Number Riddles

- Glossary
- Image Attributions

- Notes
- Notes