Contents

1. Section A: Units of Ten
2. Lesson 1: Count Large Collections
   1. Warm-up: Choral Count: Count by 10
   2. 1.3: Centers: Choice Time
3. Lesson 2: Match Representations of Tens
   1. Warm-up: Estimation Exploration: Cubes and Towers
4. Lesson 3: Addition and Subtraction with Tens
   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
5. Lesson 4: More Addition and Subtraction with Tens
   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
6. Lesson 5: Center Day 1
   1. Warm-up: Which One Doesn’t Belong: Tens
   2. 5.2: Centers: Choice Time
   3. Section A Practice Problems
7. Section B: Tens and Ones
8. Lesson 6: Count Larger Collections
   1. 6.2: Noah Counts a Collection
   2. 6.3: Centers: Choice Time
9. Lesson 7: Numbers With Tens and Ones
   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
10. Lesson 8: Different Representations of Tens and Ones
    1. Warm-up: Estimation Exploration: How Many?
    2. 8.1: Compare Representations of a Collection
    3. 8.2: Card Sort: Base-ten Representations
11. Lesson 9: Show Me Your Number
    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
12. Lesson 10: Write Two-digit Numbers
    1. Warm-up: Notice and Wonder: Same Digit, Different Place
    2. 10.1: Write Numbers to Match Base-Ten Representations
13. Lesson 11: Add Tens to Two-digit Numbers
    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
14. Lesson 12: Mentally Add and Subtract Tens
    1. Warm-up: Number Talk: Add and Subtract 10
    2. 12.2: Add and Subtract 10
15. Lesson 13: Center Day 2
    1. Warm-up: Number Talk: Within 20
    2. 13.1: Centers: Choice Time
    3. 13.2: Centers Choice Time
    4. Section B Practice Problems
16. Section C: Compare Numbers to 99
17. Lesson 14: Let’s Compare
    1. 14.1: Which is More?
    2. 14.2: Elena and Noah Compare Numbers
    3. 14.3: Centers: Choice Time
18. Lesson 15: Greater Than, Less Than
    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
19. Lesson 16: Write Comparisons with Symbols
    1. Warm-up: Notice and Wonder: 49 and 45
    2. 16.2: Make the Statement True
20. Lesson 17: Compare and Order Numbers
    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
21. Lesson 18: Center Day 3
    1. Warm-up: Number Talk: Start with 32
    2. 18.2: Centers: Choice Time
    3. Section C Practice Problems
22. Section D: Different Ways to Make a Number
23. Lesson 19: Make Two-digit Numbers
    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
24. Lesson 20: Make Two-Digit Numbers in Different Ways
    1. Warm-up: Estimation Exploration: Tens and Ones
    2. 20.1: All The Ways to Make 94
    3. 20.2: Mystery Bags
25. Lesson 21: Compare Two-Digit Numbers Shown in Different Ways
    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
26. Lesson 22: Center Day 4
    1. Warm-up: True or False: Tens and Ones
    2. 22.2: Center: Choice Time
27. Lesson 23: Two-Digit Numbers in Our World
    1. Warm-up: Estimation Exploration: Beans
    2. 23.1: Count the Objects
    3. 23.2: Quantities Card Sort
    4. Section D Practice Problems
28. Glossary
29. Attributions
30. Notes
31. Notes
32. Section A: Units of Ten
33. Lesson 1: Count Large Collections
    1. Warm-up: Choral Count: Count by 10
    2. 1.3: Centers: Choice Time
34. Lesson 2: Match Representations of Tens
    1. Warm-up: Estimation Exploration: Cubes and Towers
35. Lesson 3: Addition and Subtraction with Tens
    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
36. Lesson 4: More Addition and Subtraction with Tens
    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
37. Lesson 5: Center Day 1
    1. Warm-up: Which One Doesn’t Belong: Tens
    2. 5.2: Centers: Choice Time
    3. Section A Practice Problems
38. Section B: Tens and Ones
39. Lesson 6: Count Larger Collections
    1. 6.2: Noah Counts a Collection
    2. 6.3: Centers: Choice Time
40. Lesson 7: Numbers With Tens and Ones
    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
41. Lesson 8: Different Representations of Tens and Ones
    1. Warm-up: Estimation Exploration: How Many?
    2. 8.1: Compare Representations of a Collection
    3. 8.2: Card Sort: Base-ten Representations
42. Lesson 9: Show Me Your Number
    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
43. Lesson 10: Write Two-digit Numbers
    1. Warm-up: Notice and Wonder: Same Digit, Different Place
    2. 10.1: Write Numbers to Match Base-Ten Representations
44. Lesson 11: Add Tens to Two-digit Numbers
    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
45. Lesson 12: Mentally Add and Subtract Tens
    1. Warm-up: Number Talk: Add and Subtract 10
    2. 12.2: Add and Subtract 10
46. Lesson 13: Center Day 2
    1. Warm-up: Number Talk: Within 20
    2. 13.1: Centers: Choice Time
    3. 13.2: Centers Choice Time
    4. Section B Practice Problems
47. Section C: Compare Numbers to 99
48. Lesson 14: Let’s Compare
    1. 14.1: Which is More?
    2. 14.2: Elena and Noah Compare Numbers
    3. 14.3: Centers: Choice Time
49. Lesson 15: Greater Than, Less Than
    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
50. Lesson 16: Write Comparisons with Symbols
    1. Warm-up: Notice and Wonder: 49 and 45
    2. 16.2: Make the Statement True
51. Lesson 17: Compare and Order Numbers
    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
52. Lesson 18: Center Day 3
    1. Warm-up: Number Talk: Start with 32
    2. 18.2: Centers: Choice Time
    3. Section C Practice Problems
53. Section D: Different Ways to Make a Number
54. Lesson 19: Make Two-digit Numbers
    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
55. Lesson 20: Make Two-Digit Numbers in Different Ways
    1. Warm-up: Estimation Exploration: Tens and Ones
    2. 20.1: All The Ways to Make 94
    3. 20.2: Mystery Bags
56. Lesson 21: Compare Two-Digit Numbers Shown in Different Ways
    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
57. Lesson 22: Center Day 4
    1. Warm-up: True or False: Tens and Ones
    2. 22.2: Center: Choice Time
58. Lesson 23: Two-Digit Numbers in Our World
    1. Warm-up: Estimation Exploration: Beans
    2. 23.1: Count the Objects
    3. 23.2: Quantities Card Sort
    4. Section D Practice Problems
59. Glossary
60. Attributions
61. Notes
62. Notes