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