| 1) | 91 − 17 = | 2) | -638 − 962 = | 3) | -898 − 13 = |
| 4) | 654 + 935 = | 5) | -978 + 957 = | 6) | 636 + 774 = |
| 1) | 91 − 17 = 74 | 2) | -638 − 962 = -1600 | 3) | -898 − 13 = -911 |
| 4) | 654 + 935 = 1589 | 5) | -978 + 957 = -21 | 6) | 636 + 774 = 1410 |