| 1) | 635 − 252 = | 2) | 447 + 22 = | 3) | -959 + 949 = |
| 4) | -551 − 481 = | 5) | -228 − 603 = | 6) | -788 − 428 = |
| 1) | 635 − 252 = 383 | 2) | 447 + 22 = 469 | 3) | -959 + 949 = -10 |
| 4) | -551 − 481 = -1032 | 5) | -228 − 603 = -831 | 6) | -788 − 428 = -1216 |