| 1) | 649 − 305 = | 2) | -863 + 82 = | 3) | -157 − 720 = |
| 4) | 170 − 714 = | 5) | 27 + 778 = | 6) | 103 + 35 = |
| 1) | 649 − 305 = 344 | 2) | -863 + 82 = -781 | 3) | -157 − 720 = -877 |
| 4) | 170 − 714 = -544 | 5) | 27 + 778 = 805 | 6) | 103 + 35 = 138 |