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