4．用竖式计算（第一行竖式计算并验算）
| 675+239 | 600-326 | 59+437 |
| 41÷9 | 17÷2 | 63÷8 |
2．口算
0 158350 158358 158364 158368 158374 158376 158380 158386 158388 158394 158400 158404 158406 158410 158416 158418 158424 158428 158430 158434 158436 158440 158442 158444 158445 158446 158448 158449 158450 158452 158454 158458 158460 158464 158466 158470 158476 158478 158484 158488 158490 158494 158500 158506 158508 158514 158518 158520 158526 158530 158536 158544 199269
| 1100-400= | 84-20= | 900+2500= | 1800-900= |
| 42÷7= | 7×9= | 14÷2= | 50-28= |
| 800+600= | 24÷6= | 47-29= | 54-30= |
| 57+42= | 8×4= | 2×9= | 6÷3×8= |
| 44+38= | 63-26= | 60÷8= | 3+5×6= |