| Subtraction | 16 | 17 | 18 | 19 | 20 |
| 8 | 16-8 = 8 | 17-8 = 9 | 18-8 = 10 | 19-8 = 11 | 20-8 = 12 |
| 9 | 16-9 = 7 | 17-9 = 8 | 18-9 = 9 | 19-9 = 10 | 20-9 = 11 |
| 10 | 16-10 = 6 | 17-10 = 7 | 18-10 = 8 | 19-10 = 9 | 20-10 = 10 |
| 11 | 16-11 = 5 | 17-11 = 6 | 18-11 = 7 | 19-11 = 8 | 20-11 = 9 |
| 12 | 16-12 = 4 | 17-12 = 5 | 18-12 = 6 | 19-12 = 7 | 20-12 = 8 |
| Subtraction | 15.1 | 15.2 | 15.3 | 15.4 | 15.5 | 15.6 |
| 7.1 | 15.1-7.1 = 8 | 15.2-7.1 = 8.1 | 15.3-7.1 = 8.2 | 15.4-7.1 = 8.3 | 15.5-7.1 = 8.4 | 15.6-7.1 = 8.5 |
| 7.2 | 15.1-7.2 = 7.9 | 15.2-7.2 = 8 | 15.3-7.2 = 8.1 | 15.4-7.2 = 8.2 | 15.5-7.2 = 8.3 | 15.6-7.2 = 8.4 |
| 7.3 | 15.1-7.3 = 7.8 | 15.2-7.3 = 7.9 | 15.3-7.3 = 8 | 15.4-7.3 = 8.1 | 15.5-7.3 = 8.2 | 15.6-7.3 = 8.3 |
| 7.4 | 15.1-7.4 = 7.7 | 15.2-7.4 = 7.8 | 15.3-7.4 = 7.9 | 15.4-7.4 = 8 | 15.5-7.4 = 8.1 | 15.6-7.4 = 8.2 |
| 7.5 | 15.1-7.5 = 7.6 | 15.2-7.5 = 7.7 | 15.3-7.5 = 7.8 | 15.4-7.5 = 7.9 | 15.5-7.5 = 8 | 15.6-7.5 = 8.1 |
| 7.6 | 15.1-7.6 = 7.5 | 15.2-7.6 = 7.6 | 15.3-7.6 = 7.7 | 15.4-7.6 = 7.8 | 15.5-7.6 = 7.9 | 15.6-7.6 = 8 |