| 1) | 727 + 171 = | 2) | 638 − 687 = | 3) | 765 + 86 = |
| 4) | 923 + 405 = | 5) | -641 + 570 = | 6) | -984 − 84 = |
| 1) | 727 + 171 = 898 | 2) | 638 − 687 = -49 | 3) | 765 + 86 = 851 |
| 4) | 923 + 405 = 1328 | 5) | -641 + 570 = -71 | 6) | -984 − 84 = -1068 |