| 20 + 20 = | 50 - 40 = | 10 + 90 = | 60 - 30 = | 90 + 10 = | 100 - 70 = |
| 80 - 70 = | 40 + 40 = | 10 + 70 = | 50 - 20 = | 50 + 40 = | 70 - 30 = |
| 10 + 10 = | 60 - 30 = | 70 + 30 = | 60 - 40 = | 80 - 20 = | 60 + 40 = |
| 50 + 0 = | 90 - 50 = | 40 - 10 = | 10 + 90 = | 30 + 40 = | 70 - 0 = |
| 20 - 10 = | 60 + 10 = | 100 - 10 = | 30 + 70 = | 20 + 80 = | 100 - 30 = |