| 1) | 257 + 851 = | 2) | -356 − 728 = | 3) | -360 − 644 = |
| 4) | 934 + 356 = | 5) | -196 + 521 = | 6) | -775 − 245 = |
| 1) | 257 + 851 = 1108 | 2) | -356 − 728 = -1084 | 3) | -360 − 644 = -1004 |
| 4) | 934 + 356 = 1290 | 5) | -196 + 521 = 325 | 6) | -775 − 245 = -1020 |