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进位加法速算技巧
更新时间: 2021-01-11 01:18:52  

1、进位加法算式(一定要观察是否进位)。加法速算技巧 进位加法的关键是向高一位进1,进1既然已经是一定的事情,可不可以先进1呢?观察好后可以从高位先算起。

2、A 两位数加一位数:先写上十位数加1的和,再接着写个位数的和的个位数(用二十以内加法口诀)

3、B 两位数加一位数:先写上两位数凑成整十后的十位数,再写上一位数分出一个数后剩余的数。(即把一位数分开,帮两 位数凑十)

4、加法速算技巧 15+8= 过程:15+5=20 先写2,8分出5后剩余3,再接着写3。

关键词: 加法 技巧

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