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