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一年级珠心算口诀
更新时间: 2021-02-15 11:43:40  

1、补数加减: 加时,本档要满十,进一补数来加;

2、减时,本档不够减,退一还补数来减.

3、拨珠指法:进一双分,退一双合

4、拨珠口诀

加一:进一双分九 减一:退一双合九

加二:进一双分八 减二:退一双合八

关键词: 年级 心算 口诀

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