Subtraction and addition to 20
(1) Enter the number in the box
| 9 + 2 = | 18 - = 3 | 17 - 10 = |
| 7 - 1 = | 18 - = 11 | 11 + 7 = |
| 6 + 4 = | 20 - = 17 | 10 + 6 = |
| 6 + 5 = | 16 - = 10 | 14 - 4 = |
| 7 + 5 = | 16 - = 13 | 14 + = 19 |
| 8 + 8 = | 15 - = 14 | 20 - = 11 |
| 8 - 7 = | 18 - = 10 | 20 - = 7 |
| 6 - 2 = | 12 + = 17 | 8 + = 15 |
| 6 - 5 = | 10 + = 18 | 4 + = 15 |
| 11 - 6 = | 13 + = 17 | + 5 = 11 |
| 19 - 10 = | 19 + = 20 | - 4 = 15 |
| 9 - 3 = | 16 - = 12 | + 4 = 12 |
| 15 + 3 = | 18 - = 14 | + 6 = 16 |
| 19 + 2 = | - 3 = 15 | - 4 = 14 |
| 18 - 4 = | + 9 = 16 | 17 + = 18 |
| 14 - 3 = | - 7 = 8 | 17 - = 12 |
| 12 + 6 = | 15 - = 12 | 10 - = 3 |
| 16 - 7 = | 18 - 4 = | 16 - 8 = |
| 18 - 5 = | 13 + 6 = | 7 + 6 = |
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