| Subtraction | 16 | 17 | 18 | 19 | 20 |
| 5 | 16-5 = 11 | 17-5 = 12 | 18-5 = 13 | 19-5 = 14 | 20-5 = 15 |
| 6 | 16-6 = 10 | 17-6 = 11 | 18-6 = 12 | 19-6 = 13 | 20-6 = 14 |
| 7 | 16-7 = 9 | 17-7 = 10 | 18-7 = 11 | 19-7 = 12 | 20-7 = 13 |
| 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 |
| Subtraction | 15.1 | 15.2 | 15.3 | 15.4 | 15.5 | 15.6 |
| 4.1 | 15.1-4.1 = 11 | 15.2-4.1 = 11.1 | 15.3-4.1 = 11.2 | 15.4-4.1 = 11.3 | 15.5-4.1 = 11.4 | 15.6-4.1 = 11.5 |
| 4.2 | 15.1-4.2 = 10.9 | 15.2-4.2 = 11 | 15.3-4.2 = 11.1 | 15.4-4.2 = 11.2 | 15.5-4.2 = 11.3 | 15.6-4.2 = 11.4 |
| 4.3 | 15.1-4.3 = 10.8 | 15.2-4.3 = 10.9 | 15.3-4.3 = 11 | 15.4-4.3 = 11.1 | 15.5-4.3 = 11.2 | 15.6-4.3 = 11.3 |
| 4.4 | 15.1-4.4 = 10.7 | 15.2-4.4 = 10.8 | 15.3-4.4 = 10.9 | 15.4-4.4 = 11 | 15.5-4.4 = 11.1 | 15.6-4.4 = 11.2 |
| 4.5 | 15.1-4.5 = 10.6 | 15.2-4.5 = 10.7 | 15.3-4.5 = 10.8 | 15.4-4.5 = 10.9 | 15.5-4.5 = 11 | 15.6-4.5 = 11.1 |
| 4.6 | 15.1-4.6 = 10.5 | 15.2-4.6 = 10.6 | 15.3-4.6 = 10.7 | 15.4-4.6 = 10.8 | 15.5-4.6 = 10.9 | 15.6-4.6 = 11 |