| 1) | 77 + 53 = | 2) | -328 − 155 = | 3) | 390 + 358 = |
| 4) | 279 − 249 = | 5) | 507 + 447 = | 6) | -267 + 219 = |
| 1) | 77 + 53 = 130 | 2) | -328 − 155 = -483 | 3) | 390 + 358 = 748 |
| 4) | 279 − 249 = 30 | 5) | 507 + 447 = 954 | 6) | -267 + 219 = -48 |