题目内容
列竖式计算下面各题并验算.
(1)2.4+4.56= | (2)100-21.35= | (3)8.5-6.69= |
分析:根据小数加减法竖式计算的方法进行计算即可;加法的验算一般用减法,减法的计算一般要用加法.
解答:解:(1)2.4+4.56=6.96
![](http://thumb.1010pic.com/pic3/upload/images/201212/34/fa748a0a.png)
验算:
![](http://thumb.1010pic.com/pic3/upload/images/201212/34/0e5dff40.png)
(2)100-21.35=78.65
![](http://thumb.1010pic.com/pic3/upload/images/201212/34/08358380.png)
验算:
![](http://thumb.1010pic.com/pic3/upload/images/201212/34/2cc3547e.png)
(3)8.5-6.69=1.81
![](http://thumb.1010pic.com/pic3/upload/images/201212/34/c64d8db4.png)
验算:
![](http://thumb.1010pic.com/pic3/upload/images/201212/34/3e629253.png)
![](http://thumb.1010pic.com/pic3/upload/images/201212/34/fa748a0a.png)
验算:
![](http://thumb.1010pic.com/pic3/upload/images/201212/34/0e5dff40.png)
(2)100-21.35=78.65
![](http://thumb.1010pic.com/pic3/upload/images/201212/34/08358380.png)
验算:
![](http://thumb.1010pic.com/pic3/upload/images/201212/34/2cc3547e.png)
(3)8.5-6.69=1.81
![](http://thumb.1010pic.com/pic3/upload/images/201212/34/c64d8db4.png)
验算:
![](http://thumb.1010pic.com/pic3/upload/images/201212/34/3e629253.png)
点评:本题主要考查小数加减法的笔算和验算,根据各自的计算方法和验算方法进行计算即可.
![](http://thumb2018.1010pic.com/images/loading.gif)
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