Contents

1. Section A: Add and Subtract Within 20
2. Lesson 1: Addition Fluency Within 10
   1. Warm-up: How Many Do You See: Within 10
   2. 1.1: Sums I've Got
   3. 1.2: Centers: Choice Time
3. Lesson 2: Relate Addition and Subtraction
   1. Warm-up: Number Talk: Connect Addition and Subtraction
   2. 2.1: Cube Tower Addition and Subtraction
   3. 2.2: Find the Unknown Number
   4. 2.3: Differences I've Got
4. Lesson 3: Add and Subtract Within 20
   1. Warm-up: Number Talk: Use Known Sums
   2. 3.1: Many Ways to Add and Subtract
   3. 3.2: Heads Up
5. Section B: Story Problems
6. Lesson 4: Change Unknown Story Problems
   1. Warm-up: How Many Do You See: Numbers to 20
   2. 4.1: Field Trip to the Aquarium
   3. 4.2: Find the Unknown Number
7. Lesson 5: Put Together and Take Apart Story Problems
   1. Warm-up: True or False: More or Less
   2. 5.1: At the Planetarium
   3. 5.2: Which Equations Match?
8. Lesson 6: Compare Story Problems
   1. Warm-up: Which One Doesn’t Belong: Equations
   2. 6.1: The School Carnival
   3. 6.2: How Many Rides?
9. Section C: Numbers to 120
10. Lesson 7: Count Large Collections
    1. Warm-up: What Do You Know About 103?
    2. 7.2: Count and Represent
    3. 7.3: How Many Cats?
11. Lesson 8: Show Me All the Ways
    1. Warm-up: Estimation Exploration: Tens and Ones
    2. 8.3: Centers: Choice Time
12. Lesson 9: Solve Number Riddles
    1. Warm-up: True or False: Comparison Statements
    2. 9.1: A Number Riddle
    3. 9.2: More Number Riddles
13. Lesson 10: Write Number Riddles
    1. Warm-up: True or False: Add within 100
    2. 10.1: Write Number Riddles
    3. 10.2: Solve Our Number Riddles
14. Glossary
15. Attributions
    1. Image Attributions
16. Notes
17. Notes