题目内容
列竖式计算
(1)73×356=
(2)309×21=
(3)820×14=
(4)25×306=
(1)73×356=
(2)309×21=
(3)820×14=
(4)25×306=
分析:三位数乘两位数,先用两位数个位上的数去乘三位数,得数的末尾和个位对齐,再用两位数十位上的数去乘三位数,得数的末尾和十位对齐,最后把两次乘得的数加起来,据此列竖式计算.
解答:解:(1)73×356=25988;
![](http://thumb.1010pic.com/pic3/upload/images/201205/79/efcce86f.png)
(2)309×21=6489;
![](http://thumb.1010pic.com/pic3/upload/images/201205/79/a3f9df19.png)
(3)820×14=11480;
![](http://thumb.1010pic.com/pic3/upload/images/201205/79/296df887.png)
(4)25×306=7650.
![](http://thumb.1010pic.com/pic3/upload/images/201205/79/92e21d86.png)
![](http://thumb.1010pic.com/pic3/upload/images/201205/79/efcce86f.png)
(2)309×21=6489;
![](http://thumb.1010pic.com/pic3/upload/images/201205/79/a3f9df19.png)
(3)820×14=11480;
![](http://thumb.1010pic.com/pic3/upload/images/201205/79/296df887.png)
(4)25×306=7650.
![](http://thumb.1010pic.com/pic3/upload/images/201205/79/92e21d86.png)
点评:此题考查列竖式计算三位数乘两位数,按照正确的方法计算即可.
![](http://thumb2018.1010pic.com/images/loading.gif)
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