| 1) | 4 | + | 1 | = | 5 | ; |
| 7 | 7 | 7 |
| 2) | 7 | + | 3 | = | 10 | ; |
| 12 | 12 | 12 |
| 3) | 5 | + | 11 | = | 16 | ; |
| 19 | 19 | 19 |
| 4) | 5 | + | 6 | = | 11 | ; |
| 11 | 11 | 11 |
| 5) | 4 | + | 4 | = | 8 | ; |
| 5 | 5 | 5 |
| 6) | 7 | + | 9 | = | 16 | = 1 | 3 | ; |
| 13 | 13 | 13 | 13 |
| 7) | 7 | – | 1 | = | 6 | ; |
| 8 | 8 | 8 |
| 8) | 19 | – | 18 | = | 1 | ; |
| 37 | 37 | 37 |
| 9) | 37 | – | 37 | = 0; |
| 49 | 49 |
| 10) | 42 | – | 12 | = | 30 | ; |
| 55 | 55 | 55 |
| 11) | 4 | – | 2 | = | 2 | ; |
| 7 | 7 | 7 |
| 12) | 39 | – | 22 | = | 17 | . |
| 47 | 47 | 47 |