题目内容
用竖式算一算. 0.362×580= |
108.9÷3.3= |
0.58×0.24=验算: |
21÷24=验算: | 324.57÷7≈(得数保留两位小数) | 7.525÷0.38≈(得数保留两位小数) |
分析:根据小数乘除法竖式计算方法进行计算即可;乘法的验算一般用除法;除法的验算一般用乘法;要用四舍五入法保留小数位数.
解答:解:0.362×580=209.96
![](http://thumb.zyjl.cn/pic3/upload/images/201210/61/1117a450.png)
108.9÷3.3=33
![](http://thumb.zyjl.cn/pic3/upload/images/201210/61/bcb43642.png)
0.58×0.24=0.1392
![](http://thumb.zyjl.cn/pic3/upload/images/201210/61/238f935c.png)
验算:
![](http://thumb.zyjl.cn/pic3/upload/images/201210/61/f6683638.png)
21÷24=0.875
![](http://thumb.zyjl.cn/pic3/upload/images/201210/61/a63c6d3f.png)
验算:
![](http://thumb.zyjl.cn/pic3/upload/images/201210/61/610cb800.png)
324.57÷7≈46.37
![](http://thumb.zyjl.cn/pic3/upload/images/201210/61/36602c39.png)
7.525÷0.38≈19.80
![](http://thumb.zyjl.cn/pic3/upload/images/201210/61/0421de26.png)
![](http://thumb.zyjl.cn/pic3/upload/images/201210/61/1117a450.png)
108.9÷3.3=33
![](http://thumb.zyjl.cn/pic3/upload/images/201210/61/bcb43642.png)
0.58×0.24=0.1392
![](http://thumb.zyjl.cn/pic3/upload/images/201210/61/238f935c.png)
验算:
![](http://thumb.zyjl.cn/pic3/upload/images/201210/61/f6683638.png)
21÷24=0.875
![](http://thumb.zyjl.cn/pic3/upload/images/201210/61/a63c6d3f.png)
验算:
![](http://thumb.zyjl.cn/pic3/upload/images/201210/61/610cb800.png)
324.57÷7≈46.37
![](http://thumb.zyjl.cn/pic3/upload/images/201210/61/36602c39.png)
7.525÷0.38≈19.80
![](http://thumb.zyjl.cn/pic3/upload/images/201210/61/0421de26.png)
点评:本题主要考查小数乘除法的笔算和验算,根据各自的计算方法及验算方法进行计算和验算即可;要用四舍五入法保留小数位数.
![](http://thumb.zyjl.cn/images/loading.gif)
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