| Subtraction | 2 | 3 | 4 | 5 | 6 |
| 16 | 2-16 = -14 | 3-16 = -13 | 4-16 = -12 | 5-16 = -11 | 6-16 = -10 |
| 17 | 2-17 = -15 | 3-17 = -14 | 4-17 = -13 | 5-17 = -12 | 6-17 = -11 |
| 18 | 2-18 = -16 | 3-18 = -15 | 4-18 = -14 | 5-18 = -13 | 6-18 = -12 |
| 19 | 2-19 = -17 | 3-19 = -16 | 4-19 = -15 | 5-19 = -14 | 6-19 = -13 |
| 20 | 2-20 = -18 | 3-20 = -17 | 4-20 = -16 | 5-20 = -15 | 6-20 = -14 |
| Subtraction | 1.1 | 1.2 | 1.3 | 1.4 | 1.5 |
| 15.1 | 1.1-15.1 = -14 | 1.2-15.1 = -13.9 | 1.3-15.1 = -13.8 | 1.4-15.1 = -13.7 | 1.5-15.1 = -13.6 |
| 15.2 | 1.1-15.2 = -14.1 | 1.2-15.2 = -14 | 1.3-15.2 = -13.9 | 1.4-15.2 = -13.8 | 1.5-15.2 = -13.7 |
| 15.3 | 1.1-15.3 = -14.2 | 1.2-15.3 = -14.1 | 1.3-15.3 = -14 | 1.4-15.3 = -13.9 | 1.5-15.3 = -13.8 |
| 15.4 | 1.1-15.4 = -14.3 | 1.2-15.4 = -14.2 | 1.3-15.4 = -14.1 | 1.4-15.4 = -14 | 1.5-15.4 = -13.9 |
| 15.5 | 1.1-15.5 = -14.4 | 1.2-15.5 = -14.3 | 1.3-15.5 = -14.2 | 1.4-15.5 = -14.1 | 1.5-15.5 = -14 |
| 15.6 | 1.1-15.6 = -14.5 | 1.2-15.6 = -14.4 | 1.3-15.6 = -14.3 | 1.4-15.6 = -14.2 | 1.5-15.6 = -14.1 |