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加法口算技巧

更新时间: 2021-03-20 08:51:53     

1、减法,想加法。利用减法是加法的逆运算关系,用加法来思考。如,12-8,想8+( )=12。

2、破十法。如 13-7用“破十法”可以这样想:10-7+3=6

3、连减法(平时法),如13-7用‘连减法’可以这样想:13-3-4=6,也就是把7分成3和4。

4、加补法。如13-7还可以这样想:13-10+3=6

关键词: 加法 技巧

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