| 2.5+3.7= | 217÷7= | 70-34= |
| 1.2×0.5= | 1.3+27= | 1.5÷0.5= |
| 4.5-0.5= | 25×0.4= | = |
= | = | = |
= | = | = |
= |
| 2.5+3.7=6.2, | 217÷7=31, | 70-34=36, |
| 1.2×0.5=0.6, | 1.3+27=28.3, | 1.5÷0.5=3, |
| 4.5-0.5=4, | 25×0.4=10, | = , |
= , | =20, | = , |
=24, | = , | = , |
= . |
分析:根据小数和分数加减方法的计算方法进行计算.
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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