| 1) | -840 − 152 = | 2) | 451 + 68 = | 3) | 668 + 531 = |
| 4) | -315 + 401 = | 5) | -456 − 820 = | 6) | 180 + 933 = |
| 1) | -840 − 152 = -992 | 2) | 451 + 68 = 519 | 3) | 668 + 531 = 1199 |
| 4) | -315 + 401 = 86 | 5) | -456 − 820 = -1276 | 6) | 180 + 933 = 1113 |