2.NBT.7
Add and subtract within 1000, 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. Understand that in adding or subtracting three- digit numbers, one adds or subtracts hundreds and hundreds, tens and tens, ones and ones; and sometimes it is necessary to compose or decompose tens or hundreds.
| 1. | 100 Grid: Start at 27. Add 3 tens | |
| 2. | 100 Grid: Start at 7. Add 4 tens | |
| 3. | 100 Grid: Start at 25. Add 3 tens | |
| 4. | 100 Grid: Start at 54. Add 2 tens | |
| 5. | 100 Grid: Start at 63. Add 1 ten | |
| 6. | 100 Grid: Start at 22. Add 5 tens | |
| 7. | Now Add This! 19+20, 19+24 | |
| 8. | Now Add This! 26+21, 26+31 | |
| 9. | Now Add This! 52+20, 52+17 | |
| 10. | 100 grid: Start at 73. Add 7. | |
| 11. | 100 grid: Start at 45. Add 8. | |
| 12. | 100 grid: Start at 26. Add 5. | |
| 13. | 100 grid: Start at 68. Add 4. | |
| 14. | 100 grid: Start at 52. Add 7. | |
| 15. | Add on tens: Add 10, 20 to 35 | |
| 16. | Add on tens: Add 10, 20 to 16. | |
| 17. | Add on tens: Add 10, 20 to 36 | |
| 18. | Thinking in tens: Add 10, 19 to 19 | |
| 19. | Thinking in tens: Add 10, 11 to 14 | |
| 20. | The 1 Family - Add 1, add 11 to 35 | |
| 21. | The 1 Family - Add 1, add 11 to 27 | |
| 22. | The 1 Family - Add 1, add 11 to 49 | |
| 23. | The 1 Family - Add 1, add 11 to 57 | |
| 24. | The 1 Family - Add 1, add 11 to 83 | |
| 25. | 100 grid: 69 take away 11 | |
| 26. | 100 grid: 82 take away 9 | |
| 27. | 100 grid: 25 take away 9 | |
| 28. | 100 grid: 57 take away 9 | |
| 29. | 100 grid: 44 take away 9 | |
| 30. | 100 grid: 98 take away 9 | |
| 31. | 100 grid: 88 take away 11 | |
| 32. | 100 grid: 11 take away 11 | |
| 33. | 100 grid: 23 take away 11 | |
| 34. | 100 grid: 64 take away 11 | |
| 35. | 100 grid: 73 take away 11 | |
| 36. | 100 grid: 99 take away 11 | |
| 37. | Subtract from 100: 100 - 30, 40 & 20 | |
| 38. | Subtract from 100: 100 - 20, 30 & 70 | |
| 39. | Subtract from 100: 100 - 70, 20 & 40 | |
| 40. | Subtract from 100: 100 - 40, 90 & 50 | |
| 41. | Subtract from 100: 100 - 60, 20 & 100 | |
| 42. | 100 grid: 76 take away 7 | |
| 43. | 100 grid: 54 take away 8 | |
| 44. | 100 grid: 64 take away 9 | |
| 45. | 100 grid: 23 take away 7 | |
| 46. | 100 grid: 71 take away 8 | |
| 47. | 100 grid: 34 take away 6 | |
| 48. | The 9 family: Take 9, 19 & 29 from 65 | |
| 49. | The 9 family: Take 9, 19 & 29 from 72 | |
| 50. | Subtract 7 from 24, 22 & 25 | |
| 51. | Subtract 5 from 21, 20 & 24 | |
| 52. | Counting Stars - count by tens |