12．列竖式计算．
| 650+270= | 700-530= | 604-197= |
| 438+562= | 429+249= | 900-629= |
11．口算．
0 162375 162383 162389 162393 162399 162401 162405 162411 162413 162419 162425 162429 162431 162435 162441 162443 162449 162453 162455 162459 162461 162465 162467 162469 162470 162471 162473 162474 162475 162477 162479 162483 162485 162489 162491 162495 162501 162503 162509 162513 162515 162519 162525 162531 162533 162539 162543 162545 162551 162555 162561 162569 199269
| 360-120= | 580-220= | 490+510= | 190+650= |
| 65+48= | 97+153= | 485+132= | 638+160= |
| 865-589= | 532-69= | 105-48= | 472-427= |