题目内容
先根据乘法算式估计商是几,再计算.
(1)85×5=425
412÷85
495÷85
515÷85
(2)52×7=364
346÷52
426÷52
382÷52.
(1)85×5=425
412÷85
495÷85
515÷85
(2)52×7=364
346÷52
426÷52
382÷52.
分析:先根据乘法算式分别估测出商,再计算即可.
解答:解:(1)85×5=425
估计:412÷85≈5
495÷85≈5
515÷85≈6
计算:412÷85=4…72
![](http://thumb.1010pic.com/pic3/upload/images/201402/2/d5cc9cd6.png)
495÷85=5…70
![](http://thumb.1010pic.com/pic3/upload/images/201402/2/dd03faba.png)
515÷85=6…5
![](http://thumb.1010pic.com/pic3/upload/images/201402/2/2298749b.png)
(2)52×7=364
估计为:346÷52≈7
426÷52≈8
382÷52≈7
计算为:346÷52=6…34
![](http://thumb.1010pic.com/pic3/upload/images/201402/2/03a2c68a.png)
426÷52=8…10
![](http://thumb.1010pic.com/pic3/upload/images/201402/2/ef02c088.png)
382÷52=7…18
.
估计:412÷85≈5
495÷85≈5
515÷85≈6
计算:412÷85=4…72
![](http://thumb.1010pic.com/pic3/upload/images/201402/2/d5cc9cd6.png)
495÷85=5…70
![](http://thumb.1010pic.com/pic3/upload/images/201402/2/dd03faba.png)
515÷85=6…5
![](http://thumb.1010pic.com/pic3/upload/images/201402/2/2298749b.png)
(2)52×7=364
估计为:346÷52≈7
426÷52≈8
382÷52≈7
计算为:346÷52=6…34
![](http://thumb.1010pic.com/pic3/upload/images/201402/2/03a2c68a.png)
426÷52=8…10
![](http://thumb.1010pic.com/pic3/upload/images/201402/2/ef02c088.png)
382÷52=7…18
![](http://thumb.1010pic.com/pic3/upload/images/201402/2/86836090.png)
点评:本题主要考查了除法的估算与整数除法的计算方法.
![](http://thumb2018.1010pic.com/images/loading.gif)
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