| 1) | 333 + 275 = | 2) | 280 − 423 = | 3) | 827 − 347 = |
| 4) | -371 + 429 = | 5) | 843 + 91 = | 6) | -867 + 834 = |
| 1) | 333 + 275 = 608 | 2) | 280 − 423 = -143 | 3) | 827 − 347 = 480 |
| 4) | -371 + 429 = 58 | 5) | 843 + 91 = 934 | 6) | -867 + 834 = -33 |