14.计算
36÷4-4 | 25+15×5 | 120÷(7-3) | 72-144÷2 |
13.用竖式计算:
①38×11 | ②258÷6 | ③704÷5 |
④65×13 | ⑤419÷4验算: | ⑥840÷7验算: |
11.口算与估算
0 153412 153420 153426 153430 153436 153438 153442 153448 153450 153456 153462 153466 153468 153472 153478 153480 153486 153490 153492 153496 153498 153502 153504 153506 153507 153508 153510 153511 153512 153514 153516 153520 153522 153526 153528 153532 153538 153540 153546 153550 153552 153556 153562 153568 153570 153576 153580 153582 153588 153592 153598 153606 199269
200×8= | 540÷6= | 300×20= | 25×40= |
0÷8=3 | 0.6÷3= | 180×5= | 2×45= |
82÷9≈ | 415÷6≈ | 290÷5≈ | 360÷7≈ |
32×45≈ | 44×22≈ | 56×72≈ | 30×62≈ |