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