| 1) | 374 − 347 = | 2) | 404 + 190 = | 3) | 385 + 521 = |
| 4) | 448 + 444 = | 5) | -831 + 870 = | 6) | -51 + 685 = |
| 1) | 374 − 347 = 27 | 2) | 404 + 190 = 594 | 3) | 385 + 521 = 906 |
| 4) | 448 + 444 = 892 | 5) | -831 + 870 = 39 | 6) | -51 + 685 = 634 |