Correction :
| 7 + 24 = 31 | 37 - 13 = 24 |
| 22 - 15 = 7 | 16 + 5 = 21 |
| 17 + 10 = 27 | 12 + 1 = 13 |
| 23 + 12 = 35 | 32 - 24 = 8 |
| 15 + 12 = 27 | 1 × 11 = 11 |
| 5 + 17 = 22 | 2 × 11 = 22 |
| 12 + 3 = 15 | 15 - 0 = 15 |
| 33 - 19 = 14 | 17 - 4 = 13 |
| 14 + 7 = 21 | 18 + 4 = 22 |
| 1 - 1 = 0 | 23 + 22 = 45 |