| 直接写数对又快! 0×0.2= | 9-0.9= | - = | 10.75+2.5-10.75= |
| 72÷0.4= | 24÷ = | 13× = | ÷ = |
15× = | 0.87×100= | ÷ = | 1÷ × = |
| 0×0.2=0, | 9-0.9=8.1, | - = , | 10.75+2.5-10.75=2.5, |
| 72÷0.4=180, | 24÷ =15, | 13× = , | ÷ = , |
15× =10, | 0.87×100=87, | ÷ = , | 1÷ × = . |
分析:根据小数、分数的加减乘除的计算方法进行计算即可;10.75+2.5-10.75=10.75-10.75+2.5.
点评:口算时,注意运算顺序和符号,然后再进一步计算即可.
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