| 1) | 520 − 808 = | 2) | 133 − 11 = | 3) | -966 − 750 = |
| 4) | -402 − 27 = | 5) | 348 + 421 = | 6) | 15 + 8 = |
| 1) | 520 − 808 = -288 | 2) | 133 − 11 = 122 | 3) | -966 − 750 = -1716 |
| 4) | -402 − 27 = -429 | 5) | 348 + 421 = 769 | 6) | 15 + 8 = 23 |