| Subtraction | 7 | 8 | 9 | 10 | 11 |
| 11 | 7-11 = -4 | 8-11 = -3 | 9-11 = -2 | 10-11 = -1 | 11-11 = 0 |
| 12 | 7-12 = -5 | 8-12 = -4 | 9-12 = -3 | 10-12 = -2 | 11-12 = -1 |
| 13 | 7-13 = -6 | 8-13 = -5 | 9-13 = -4 | 10-13 = -3 | 11-13 = -2 |
| 14 | 7-14 = -7 | 8-14 = -6 | 9-14 = -5 | 10-14 = -4 | 11-14 = -3 |
| 15 | 7-15 = -8 | 8-15 = -7 | 9-15 = -6 | 10-15 = -5 | 11-15 = -4 |