| 12÷0.6= | 3.62-1.02= | 2.5÷10%= | 3.25×4= |
| 303×10%= | 8.4÷7= | 1.02+0.4= | 1-2÷7= |
| 1.5÷0.3= | 5.4+8= | 0.125×32= | 0.8+99×0.8= |
(1- )×10= | × × = | 2- - = | 1÷ × = |
| 12÷0.6=20, | 3.62-1.02=2.6, | 2.5÷10%=25, | 3.25×4=13, |
| 303×10%=30.3, | 8.4÷7=1.2, | 1.02+0.4=1.42, | 1-2÷7= , |
| 1.5÷0.3=5, | 5.4+8=13.4, | 0.125×32=4, | 0.8+99×0.8=80, |
(1- )×10=4, | × × = , | 2- - =1, | 1÷ × = . |
分析:根据小数、百分数和分数的计算方法进行计算即可;0.8+99×0.8根据乘法分配律进行简算;2-
-
=2-(
+
).点评:口算时,注意运算符号和数据,然后再进一步计算即可,能简算的要简算.
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