| 46+315= | 12.8-7.6= | 25×28= | 3.14÷0.1= |
0.24× = | + = | ÷ = | -0.25= |
× = | 1÷ = | ÷ = | 80×40%= |
| 46+315=361, | 12.8-7.6=5.2, | 25×28=700, | 3.14÷0.1=31.4, |
0.24× =0.2, | + = , | ÷ =1, | -0.25= , |
× = , | 1÷ =3, | ÷ = , | 80×40%=32. |
分析:根据整数、小数和分数加减乘除的计算方法进行计算即可.
点评:口算时,注意运算符号和数据,然后再进一步计算即可.
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