| 20 - 6 = _____ | 18 - 1 = _____ |
| 17 - 11 = _____ | 13 - 7 = _____ |
| 12 - 12 = _____ | 15 - 10 = _____ |
| 18 - 2 = _____ | 14 - 9 = _____ |
| 17 - 10 = _____ | 18 - 10 = _____ |
| 14 - 6 = _____ | 10 - 6 = _____ |
| 12 - 8 = _____ | 14 - 9 = _____ |
| 20 - 7 = _____ | 11 - 1 = _____ |
| 20 - 13 = _____ | 10 - 6 = _____ |
| 15 - 14 = _____ | 13 - 0 = _____ |