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退位減法怎麼教
退位減法怎麼教
更新时间:2024-10-01 00:18:42

  1、退位減法就是當兩個數相減,被減數的個位不夠減時,往前一位借位,相當于給這位數加上10,再進行計算。

  2、拆10法就是把被減數拆成一個10和另外一個數,比如:43-7=?我們可以讓孩子把43拆成10和33,先用10-7=3,再用3+33=36。

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