| Subtraction | 16 | 17 | 18 | 19 | 20 |
| 2 | 16-2 = 14 | 17-2 = 15 | 18-2 = 16 | 19-2 = 17 | 20-2 = 18 |
| 3 | 16-3 = 13 | 17-3 = 14 | 18-3 = 15 | 19-3 = 16 | 20-3 = 17 |
| 4 | 16-4 = 12 | 17-4 = 13 | 18-4 = 14 | 19-4 = 15 | 20-4 = 16 |
| 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 |
| Subtraction | 15.1 | 15.2 | 15.3 | 15.4 | 15.5 | 15.6 |
| 1.1 | 15.1-1.1 = 14 | 15.2-1.1 = 14.1 | 15.3-1.1 = 14.2 | 15.4-1.1 = 14.3 | 15.5-1.1 = 14.4 | 15.6-1.1 = 14.5 |
| 1.2 | 15.1-1.2 = 13.9 | 15.2-1.2 = 14 | 15.3-1.2 = 14.1 | 15.4-1.2 = 14.2 | 15.5-1.2 = 14.3 | 15.6-1.2 = 14.4 |
| 1.3 | 15.1-1.3 = 13.8 | 15.2-1.3 = 13.9 | 15.3-1.3 = 14 | 15.4-1.3 = 14.1 | 15.5-1.3 = 14.2 | 15.6-1.3 = 14.3 |
| 1.4 | 15.1-1.4 = 13.7 | 15.2-1.4 = 13.8 | 15.3-1.4 = 13.9 | 15.4-1.4 = 14 | 15.5-1.4 = 14.1 | 15.6-1.4 = 14.2 |
| 1.5 | 15.1-1.5 = 13.6 | 15.2-1.5 = 13.7 | 15.3-1.5 = 13.8 | 15.4-1.5 = 13.9 | 15.5-1.5 = 14 | 15.6-1.5 = 14.1 |