题目内容
口算下面各题. 0.5×1.2= |
1.25×0.8= | 0.16×0.5= |
0.25×4= | 3.2×0.5= | 0.2×50= |
1.1×0.1= | 1.7×0.03= | 2.4×0.5= |
0.12×7= |
分析:根据小数乘法的计算方法进行计算.
解答:解:
0.5×1.2=0.6, | 1.25×0.8=1, | 0.16×0.5=0.08, |
0.25×4=1, | 3.2×0.5=1.5, | 0.2×50=10, |
1.1×0.1=0.11, | 1.7×0.03=0.051, | 2.4×0.5=1.2, |
0.12×7=0.84. |
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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(5)3.8 -1.5= |
(6)8÷5= |
(7)0.86 -0.6= |
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(9)0.63÷7= |
(10)0.6×5= |
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口算下面各题
(1)0.5 +0.4= |
(2)0.26 +0.34= |
(3)0.07×1000= |
(4)3.2 ÷8= |
(5)3.8 -1.5= |
(6)8÷5= |
(7)0.86 -0.6= |
(8)7.6 +2.4= |
(9)0.63÷7= |
(10)0.6×5= |
(11)5 -0.5= |
(12)100×0.3= |