| 1) | -147 − 212 = | 2) | 542 + 837 = | 3) | 730 − 709 = |
| 4) | 151 − 507 = | 5) | 508 + 505 = | 6) | 963 − 32 = |
| 1) | -147 − 212 = -359 | 2) | 542 + 837 = 1379 | 3) | 730 − 709 = 21 |
| 4) | 151 − 507 = -356 | 5) | 508 + 505 = 1013 | 6) | 963 − 32 = 931 |