| 1) | -742 + 45 = | 2) | 597 − 607 = | 3) | 253 + 255 = |
| 4) | 638 − 858 = | 5) | -61 − 320 = | 6) | 526 − 889 = |
| 1) | -742 + 45 = -697 | 2) | 597 − 607 = -10 | 3) | 253 + 255 = 508 |
| 4) | 638 − 858 = -220 | 5) | -61 − 320 = -381 | 6) | 526 − 889 = -363 |