| 390-190= | 23+16= | 25×4= | 0.12×3= | 0.4×0.2= |
| 28÷28= | 0.24÷2= | 1÷5= | 9÷100= | 7÷6= |
| 100-94= | 1.7+2.3= | + = | + = | - = |
4× = | × = | ÷ = | 1- = | ÷3= |
| 390-190=200, | 23+16=39, | 25×4=100, | 0.12×3=0.36, | 0.4×0.2=0.08, |
| 28÷28=1, | 0.24÷2=0.12, | 1÷5=0.2, | 9÷100=0.09, | 7÷6= , |
| 100-94=6, | 1.7+2.3=4, | + =1, | + = , | - = , |
4× = , | × = , | ÷ = , | 1- = , | ÷3= . |
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.
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