# Contents

1. Section A: Units of Ten
1. Warm-up: Choral Count: Count by 10
2. 1.3: Centers: Choice Time
1. Warm-up: Estimation Exploration: Cubes and Towers
1. Warm-up: How Many Do You See: Groups of 10
2. 3.1: How Many Tens Now?
3. 3.2: Introduce Five in a Row, Add or Subtract 10
4. 3.3: Centers: Choice Time
1. Warm-up: Number Talk: Plus or Minus 10
2. 4.1: How Many Are in the Bag?
3. 4.2: Add and Subtract Tens
4. Section A Summary
1. Warm-up: Which One Doesn’t Belong: Tens
2. 5.2: Centers: Choice Time
3. Section A Practice Problems
2. Section B: Tens and Ones
1. 6.2: Noah Counts a Collection
2. 6.3: Centers: Choice Time
1. Warm-up: Notice and Wonder: One-and Two-digit Numbers
2. 7.1: Make It: Tens and Ones
3. 7.2: Who Do You Agree With?
4. 7.3: Centers: Choice Time
1. Warm-up: Estimation Exploration: How Many?
2. 8.1: Compare Representations of a Collection
3. 8.2: Card Sort: Base-ten Representations
1. Warm-up: Which One Doesn’t Belong: Tens and Ones
2. 9.1: Create a Collection
3. 9.2: Show Collections In Many Ways
4. 9.3: Centers: Choice Time
1. Warm-up: Notice and Wonder: Same Digit, Different Place
2. 10.1: Write Numbers to Match Base-Ten Representations
1. Warm-up: True or False: Tens and Ones
2. 11.1: Add Two-digit Numbers and Tens
3. 11.2: The Missing Digit
4. Section B Summary
1. Warm-up: Number Talk: Add and Subtract 10
2. 12.2: Add and Subtract 10
1. Warm-up: Number Talk: Within 20
2. 13.1: Centers: Choice Time
3. 13.2: Centers Choice Time
4. Section B Practice Problems
3. Section C: Compare Numbers to 99
1. 14.1: Which is More?
2. 14.2: Elena and Noah Compare Numbers
3. 14.3: Centers: Choice Time
1. Warm-up: Number Talk: Add or Subtract 10
2. 15.1: Which is Greater, Which is Less?
3. 15.2: True or False Comparisons
1. Warm-up: Notice and Wonder: 49 and 45
2. 16.2: Make the Statement True
1. Warm-up: Which One Doesn’t Belong: Comparison Statements
2. 17.1: Compare and Order Quantities
3. 17.2: Order Numbers
4. Section C Summary
2. 18.2: Centers: Choice Time
3. Section C Practice Problems
4. Section D: Different Ways to Make a Number
1. Warm-up: Which One Doesn’t Belong: Different Ways to Show a Number
2. 19.1: Make 65 Using Tens and Ones
3. 19.2: Make 37 in Different Ways
4. 19.3: Centers: Choice Time
1. Warm-up: Estimation Exploration: Tens and Ones
2. 20.1: All The Ways to Make 94
3. 20.2: Mystery Bags
1. Warm-up: Number Talk: Addition Within 20
2. 21.1: Elena and Kiran Compare Collections
3. 21.2: Base-Ten Representation Compare
4. Section D Summary
1. Warm-up: True or False: Tens and Ones
2. 22.2: Center: Choice Time
1. Warm-up: Estimation Exploration: Beans
2. 23.1: Count the Objects
3. 23.2: Quantities Card Sort
4. Section D Practice Problems
5. Glossary
7. Notes
8. Notes
9. Section A: Units of Ten
1. Warm-up: Choral Count: Count by 10
2. 1.3: Centers: Choice Time
1. Warm-up: Estimation Exploration: Cubes and Towers
1. Warm-up: How Many Do You See: Groups of 10
2. 3.1: How Many Tens Now?
3. 3.2: Introduce Five in a Row, Add or Subtract 10
4. 3.3: Centers: Choice Time
1. Warm-up: Number Talk: Plus or Minus 10
2. 4.1: How Many Are in the Bag?
3. 4.2: Add and Subtract Tens
4. Section A Summary
1. Warm-up: Which One Doesn’t Belong: Tens
2. 5.2: Centers: Choice Time
3. Section A Practice Problems
10. Section B: Tens and Ones
1. 6.2: Noah Counts a Collection
2. 6.3: Centers: Choice Time
1. Warm-up: Notice and Wonder: One-and Two-digit Numbers
2. 7.1: Make It: Tens and Ones
3. 7.2: Who Do You Agree With?
4. 7.3: Centers: Choice Time
1. Warm-up: Estimation Exploration: How Many?
2. 8.1: Compare Representations of a Collection
3. 8.2: Card Sort: Base-ten Representations
1. Warm-up: Which One Doesn’t Belong: Tens and Ones
2. 9.1: Create a Collection
3. 9.2: Show Collections In Many Ways
4. 9.3: Centers: Choice Time
1. Warm-up: Notice and Wonder: Same Digit, Different Place
2. 10.1: Write Numbers to Match Base-Ten Representations
1. Warm-up: True or False: Tens and Ones
2. 11.1: Add Two-digit Numbers and Tens
3. 11.2: The Missing Digit
4. Section B Summary
1. Warm-up: Number Talk: Add and Subtract 10
2. 12.2: Add and Subtract 10
1. Warm-up: Number Talk: Within 20
2. 13.1: Centers: Choice Time
3. 13.2: Centers Choice Time
4. Section B Practice Problems
11. Section C: Compare Numbers to 99
1. 14.1: Which is More?
2. 14.2: Elena and Noah Compare Numbers
3. 14.3: Centers: Choice Time
1. Warm-up: Number Talk: Add or Subtract 10
2. 15.1: Which is Greater, Which is Less?
3. 15.2: True or False Comparisons
1. Warm-up: Notice and Wonder: 49 and 45
2. 16.2: Make the Statement True
1. Warm-up: Which One Doesn’t Belong: Comparison Statements
2. 17.1: Compare and Order Quantities
3. 17.2: Order Numbers
4. Section C Summary
2. 18.2: Centers: Choice Time
3. Section C Practice Problems
12. Section D: Different Ways to Make a Number
1. Warm-up: Which One Doesn’t Belong: Different Ways to Show a Number
2. 19.1: Make 65 Using Tens and Ones
3. 19.2: Make 37 in Different Ways
4. 19.3: Centers: Choice Time
1. Warm-up: Estimation Exploration: Tens and Ones
2. 20.1: All The Ways to Make 94
3. 20.2: Mystery Bags
1. Warm-up: Number Talk: Addition Within 20
2. 21.1: Elena and Kiran Compare Collections
3. 21.2: Base-Ten Representation Compare
4. Section D Summary
1. Warm-up: True or False: Tens and Ones
2. 22.2: Center: Choice Time
1. Warm-up: Estimation Exploration: Beans
2. 23.1: Count the Objects
3. 23.2: Quantities Card Sort
4. Section D Practice Problems
13. Glossary