1.NBT.4
Add within 100, including adding a two-digit number and a one-digit number, and adding a two-digit number and a multiple of 10, using concrete models or drawings and strategies based on place value, properties of operations, and/or the relationship between addition and subtraction; relate the strategy to a written method and explain the reasoning used. Understand that in adding two-digit numbers, one adds tens and tens, ones and ones; and sometimes it is necessary to compose a ten.
| 1. | 2 less, 2 more than 28 | |
| 2. | 2 less, 2 more than 15 | |
| 3. | 2 less, 2 more than 23 | |
| 4. | 2 less, 2 more than 13 | |
| 5. | Which number is 10 more than 2? | |
| 6. | 20s Zone - 4 more than 22 | |
| 7. | 20s Zone - 4 more than 21 | |
| 8. | 20s Zone - 3 more than 24 | |
| 9. | 20s Zone: 18 + 2 = ?, 18 + 5 = ? | |
| 10. | True or False?: 10+7=17, 15+2=17, 17=10+7, 17+0=17 | |
| 11. | 30s Zone: 4 more than 28 | |
| 12. | 30s Zone: 7 more than 25 | |
| 13. | 30s Zone: 5 more than 29 | |
| 14. | 30s Zone: 9 more than 29 | |
| 15. | Use the Pattern: 10+2,20+2,30+2 | |
| 16. | 100 Grid: Start at 73. Add 10 | |
| 17. | 100 Grid: Start at 35. Add 10 | |
| 18. | 100 Grid: Start at 15. Add 7 | |
| 19. | 100 Grid: Start at 28. Add 8 | |
| 20. | 100 Grid: Start at 14. What is 11 more? | |
| 21. | 100 grid: 11 more than 33 | |
| 22. | 100 grid: Find 9 more than 27 | |
| 23. | 100 Grid: Start at 56. Add 10 | |
| 24. | 100 Grid: Start at 83. Add 10 | |
| 25. | 100 Grid: Start at 34. Add 10 | |
| 26. | Balloons: Total of 15 and 6 | |
| 27. | The Chicken Story: seventeen + twelve | |
| 28. | Red Blocks 4 - 1 | |
| 29. | Red Blocks 1 - 1 | |
| 30. | Red Blocks 2 - 1 | |
| 31. | Red Blocks 3 - 1 | |
| 32. | Red Blocks 5 - 1 | |
| 33. | Red Blocks 6 - 1 | |
| 34. | Red Blocks 7 - 1 | |
| 35. | Red Blocks 8 - 1 | |
| 36. | Red Blocks 9 - 1 | |
| 37. | The 20s zone: 24 - 4 = ?, 24 - 7 = ? | |
| 38. | 100 grid: 73-7 | |
| 39. | 100 grid: 23-9 | |
| 40. | 100 grid: 48-9 | |
| 41. | 100 grid: 74-7 | |
| 42. | 100 grid: 82-8 | |
| 43. | 100 grid: 54-6 | |
| 44. | 100 grid: 61-5 | |
| 45. | Red Blocks 10 - 3 | |
| 46. | Red Blocks 10 - 5 | |
| 47. | Red Blocks 10 - 6 | |
| 48. | Red Blocks 10 - 7 | |
| 49. | Red Blocks 10 - 8 | |
| 50. | Red Blocks 10 - 9 | |
| 51. | The 20s zone: 28 - 8 = ?, 28 - 9 = ? | |
| 52. | The 20s zone: 23 - 3 = ?, 23 - 4 = ? | |
| 53. | The 20s zone: 26 - 6 = ?, 26 - 8 = ? | |
| 54. | The 20s Zone: Add 6 to 18 | |
| 55. | The 20s Zone: Add 5 to 16 | |
| 56. | The 20s Zone: Add 7 to 15 | |
| 57. | The 20s Zone: Add 7 to 17 | |
| 58. | The 20s Zone: Add 6 to 17 | |
| 59. | The 20s Zone: Add 6 to 15 | |
| 60. | The 20s Zone: Add 6 to 19 |