| 1) | 526 + 211 = | 2) | -415 + 79 = | 3) | -421 − 877 = |
| 4) | 841 − 66 = | 5) | 865 + 370 = | 6) | 931 + 106 = |
| 1) | 526 + 211 = 737 | 2) | -415 + 79 = -336 | 3) | -421 − 877 = -1298 |
| 4) | 841 − 66 = 775 | 5) | 865 + 370 = 1235 | 6) | 931 + 106 = 1037 |