| 1) | 823 − 718 = | 2) | 573 + 211 = | 3) | 548 − 408 = |
| 4) | -646 − 538 = | 5) | -887 − 729 = | 6) | 935 + 105 = |
| 1) | 823 − 718 = 105 | 2) | 573 + 211 = 784 | 3) | 548 − 408 = 140 |
| 4) | -646 − 538 = -1184 | 5) | -887 − 729 = -1616 | 6) | 935 + 105 = 1040 |