| 1) | -646 + 876 = | 2) | -909 − 531 = | 3) | 680 + 175 = |
| 4) | 423 − 538 = | 5) | 130 + 960 = | 6) | 278 − 57 = |
| 1) | -646 + 876 = 230 | 2) | -909 − 531 = -1440 | 3) | 680 + 175 = 855 |
| 4) | 423 − 538 = -115 | 5) | 130 + 960 = 1090 | 6) | 278 − 57 = 221 |