| 1) | 337 + 897 = | 2) | -912 + 977 = | 3) | 61 − 6 = |
| 4) | 435 + 754 = | 5) | -492 − 428 = | 6) | 989 − 359 = |
| 1) | 337 + 897 = 1234 | 2) | -912 + 977 = 65 | 3) | 61 − 6 = 55 |
| 4) | 435 + 754 = 1189 | 5) | -492 − 428 = -920 | 6) | 989 − 359 = 630 |