| 1) | 281 − 338 = | 2) | 865 + 579 = | 3) | 622 + 233 = |
| 4) | 169 + 445 = | 5) | 143 − 250 = | 6) | 183 + 458 = |
| 1) | 281 − 338 = -57 | 2) | 865 + 579 = 1444 | 3) | 622 + 233 = 855 |
| 4) | 169 + 445 = 614 | 5) | 143 − 250 = -107 | 6) | 183 + 458 = 641 |