题目内容
| 32.8+19= | 0.51÷17= | 240÷30= | 1000×0.8= | 3.06+0.2= |
| 0.67+1.24= | 8×125= | 7-6.28= | 8.2-0.01= | 99×23= |
| 50×4= | 5÷1000= | 0.42+9.5= | 65×25×4= | 0.08÷100= |
| 10×0.5= | 1.82-0.63= | 4.5+1.5= | 1-0.63= | 231-99= |
分析:根据整数、小数加、减、乘、除法的计算法则,直接进行口算即可.其中65×25×4,运用乘法结合律进行简算.
解答:解:
| 32.8+19=51.8; | 0.51÷17=0.03; | 240÷30=8; | 1000×0.8=800; | 3.06+0.2=3.26; |
| 0.67+1.24=1.91; | 8×125=1000; | 7-6.28=0.72; | 8.2-0.01=8.19; | 99×23=2277; |
| 50×4=200; | 5÷1000=0.005; | 0.42+9.5=9.92; | 65×25×4=6500; | 0.08÷100=0.0008; |
| 10×0.5=5; | 1.82-0.63=1.19; | 4.5+1.5=6 | 1-0.63=0.37; | 231-99=132. |
点评:此题考查的目的是牢固掌握整数、小数四则运算的计算法则,并且能够正确熟练地进行口算,提高口算能力.
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