| 243+49= | 198-79= | 9.3+4.76= | 20.67-8.7 |
| 320×0.5= | 12.5× = | 45÷0.15= | - = |
| 8×12.5%= | 102-62= | 0.53= | 1÷1%= |
| 32×98≈ | 621÷59≈ | 347÷51≈ | 252×62≈ |
| 解: 243+49=292, | 198-79=119, | 9.3+4.76=14.06, | 20.67-8.7=11.97, |
| 320×0.5=160, | 12.5× =10, | 45÷0.15=300, | - = , |
| 8×12.5%=1, | 102-62=64, | 0.53=0.125, | 1÷1%=100, |
| 32×98≈3000, | 621÷59≈10, | 347÷51≈70, | 252×62≈15000. |
分析:根据整数、小数、分数四则运算的法则,以及整数乘除法估算的方法求解.
点评:本题属于基本的计算,在平时都积累经验,逐步提高运算的速度和准确性.
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