题目内容
口算 3×0.3= |
5×0.24= | 0.38+3.8= | 1-0.09= |
13.5×0.1= | 0.99+0.1= | 1×2.5-1×2.5= | 0.8+1.3-0.8+1.3= |
分析:本题根据小数乘法、加法、及减法的运算法则计算即可.
0.8+1.3-0.8+1.3可根据加法交换律计算.
0.8+1.3-0.8+1.3可根据加法交换律计算.
解答:解:
3×0.3=0.9, | 5×0.24=1.2, | 0.38+3.8=4.18, | 1-0.09=0.91, |
13.5×0.1=1.35, | 0.99+0.1=1.09, | 1×2.5-1×2.5=0, | 0.8+1.3-0.8+1.3=2.6. |
点评:完成小数加减法题目时要注意小数点的对齐,完成小数乘法题目时要注意小数点位置的变化.
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