Correction :
| 26 - 17 = 9 | 7 + 17 = 24 |
| 9 + 20 = 29 | 36 - 13 = 23 |
| 19 + 10 = 29 | 14 - 13 = 1 |
| 38 - 23 = 15 | 9 + 18 = 27 |
| 19 + 6 = 25 | 13 + 10 = 23 |
| 6 + 1 = 7 | 12 - 0 = 12 |
| 11 - 3 = 8 | 18 + 3 = 21 |
| 15 - 13 = 2 | 1 + 8 = 9 |
| 23 + 4 = 27 | 2 + 17 = 19 |
| 27 - 7 = 20 | 21 - 12 = 9 |