2.OA.2
Fluently add and subtract within 20 using mental strategies.2 By end of Grade 2, know from memory all sums of two one-digit numbers.
1. | Add these 3 numbers: 3+4+3 | |
2. | Add these 3 numbers: 2+4+1 | |
3. | Add these 3 numbers: 3+2+1 | |
4. | Add these 3 numbers: 7+1+1 | |
5. | Add these 3 numbers: 1+1+2 | |
6. | Add these 3 numbers: 5+2+1 | |
7. | Number Detectives ? + 3 = 6 | |
8. | Word Wise: 5 more than 4 | |
9. | Word Wise: 5 more than 8 | |
10. | Add these 3 numbers: 8 + 3 + 2 | |
11. | Add these 3 numbers: 9 + 1 + 6 | |
12. | Add these 3 numbers: 4 + 4 + 3 | |
13. | Word Wise: The total of 8 and 11 | |
14. | Word Wise: The sum of 14 and 3 | |
15. | Word Wise: 12 more than 5 | |
16. | Word Wise: 6 add 14 | |
17. | Word Wise: 11 plus 9 | |
18. | Same or different? Click all boxes with answer 18 | |
19. | Same or Different? Click all boxes with answer 16 | |
20. | Number detectives: Mysteries of 15 | |
21. | Number detectives: Mysteries of 16 | |
22. | Number detectives: Mysteries of 13 | |
23. | Number detectives: Mysteries of 17 | |
24. | Number detectives: Mysteries of 14 | |
25. | N/D Mysteries of 20! 17+, 11+, 15+ | |
26. | N/D Mysteries of 20! 7+, 10+, 8+ | |
27. | N/D Mysteries of 20! 6+, 9+, 3+ | |
28. | N/D Mysteries of 20! 20+, 5+, 2+ | |
29. | Use the Pattern: 4 + 9, + 10, + 11 | |
30. | Use the Pattern: 5 + 9, + 10, + 11 | |
31. | Use the Pattern: 6 + 9, + 10, + 11 | |
32. | Use the Pattern: 7 + 9, + 10, + 11 | |
33. | Use the Pattern: 8 + 9, + 10, + 11 | |
34. | Addition Chains: 3 + 2 + 4 + 2, 7 + 2 + 3 + 4 | |
35. | Subtraction chain 8 - 4 = 4, 4 - 2 = ? | |
36. | Subtraction chain 7 - 2 = 5, 5 - 2 = ? | |
37. | Subtraction chain 9 - 3 = 6, 6 - 2 = ? | |
38. | Subtraction chain 6 - 3 = 3, 3 - 1 = ? | |
39. | Subtraction chain 8 - 2 = 6, 6 - 1 = ? | |
40. | Subtraction chain 9 - 1 = 8, 8 - 2 = ? | |
41. | Subtraction chain 8 - 3 = 5, 5 - 2 = ? | |
42. | Subtraction chain 6 - 2 = 4, 4 - 2 = ? | |
43. | Subtraction chain 7 - 3 = 4, 4 - 1 = ? | |
44. | Subtraction chain 9 - 2 = 7, 7 - 3 = ? | |
45. | Number detectives: ? - 6 = 3 | |
46. | Number detectives: ? - 7 = 2 | |
47. | Number detectives: 14 - 6 = ? | |
48. | Number detectives: 15 - 9 = ? | |
49. | Number detectives: 11 - 8 = ? | |
50. | Number detectives: 13 - 5 = ? | |
51. | Number detectives: 15 - 13 = ? | |
52. | Number detectives: 14 - ? = 4 | |
53. | Number detectives: 11 - ? = 5 | |
54. | Number detectives: 10 - ? = 8 | |
55. | Number detectives: 13 - ? = 5 | |
56. | Number detectives: 14 - ? = 7 | |
57. | Word Wise: Subtract 14 from 20 | |
58. | Word Wise: 20 take away 11 | |
59. | Word Wise: 14 take away 6 | |
60. | Word Wise: 11 less than 19 | |
61. | Word Wise: 13 less than 20 | |
62. | Word Wise: 11 less than 16 | |
63. | Subtraction chain 20 - 12 = ? - 6 = 2 | |
64. | Word Wise!: Subtract 13 from 20 | |
65. | Word Wise!: Subtract 15 from 20 | |
66. | Word Wise!: Subtract 8 from 20 | |
67. | Word Wise!: Subtract 11 from 20 | |
68. | Word Wise!: Subtract 17 from 20 | |
69. | Word Wise!: Subtract 5 from 20 | |
70. | Word Wise!: 12 minus 7 | |
71. | Word Wise!: 20 take away 4 | |
72. | Word Wise!: 20 take away 7 | |
73. | Word Wise!: 19 less than 19 | |
74. | Word Wise!: 3 less than 20 | |
75. | Word Wise!: 10 less than 20 | |
76. | Subtract 8 (from 16, 15, 12) | |
77. | Subtract 6 (from 12, 11, 13) | |
78. | Subtract 5 (from 14, 11, 8) | |
79. | Subtract 7 (from 14, 16, 11) | |
80. | Subtract 4 (from 10, 12, 8) | |
81. | Subtract 8 from 17, 13 & 11 | |
82. | Subtract 6 from 13, 15 & 11 | |
83. | Subtract 9 from 12, 15 & 17 | |
84. | Build A Total - number sequence, 11 | |
85. | What Comes Next? - 10 less than 12 |