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北师大版数学二年级下册课时讲解+教学视频+课件

电子课本

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视频讲解

知识点

退位减法要牢记，先从个位来减起。

哪位不够前位退，本位加10莫忘记。

头上有点如需借，前位减1再加10。

哪一位不够减向前一位借1，再在这位上加10后继续减。各个数位在连续减的时候如果被借走了1，不要忘了减1哟！

图文讲解

注：点击下面名片小数学堂

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