| 1) | 230 + 631 = | 2) | 403 − 78 = | 3) | 674 + 706 = |
| 4) | 75 − 459 = | 5) | -722 + 397 = | 6) | 272 + 834 = |
| 1) | 230 + 631 = 861 | 2) | 403 − 78 = 325 | 3) | 674 + 706 = 1380 |
| 4) | 75 − 459 = -384 | 5) | -722 + 397 = -325 | 6) | 272 + 834 = 1106 |