1．直接写得数．
0 162386 162394 162400 162404 162410 162412 162416 162422 162424 162430 162436 162440 162442 162446 162452 162454 162460 162464 162466 162470 162472 162476 162478 162480 162481 162482 162484 162485 162486 162488 162490 162494 162496 162500 162502 162506 162512 162514 162520 162524 162526 162530 162536 162542 162544 162550 162554 162556 162562 162566 162572 162580 199269
| 90×7= | 808÷8= | 51×68≈ | 282÷7≈ |
| 9+0.8= | 1.2-0.7= | 1-0.8= | 1.7-1.5= |