８０ ÷ ２０＝

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２３. ８６. ２０. ８０ ÷ ２０＝. ４. 商の見当をつける. ２０. 商が大きすぎた. ４. ２３ × ４＝. ９. ２. × 　４. ひけない. ２０. １小さくする. ４. ×. ２０. １小さくする. ３. ２３ × ３＝. ６. ９. × 　３. ２０. ３. ６. ９. × 　３. １. ７. 見当をつけた商が大きすぎたら，商を小さくします。. １２. ８１. １０. ８０ ÷ １０＝. ８. 商の見当をつける. １０. 商が大きすぎた. ８. １２ × ８＝. ９. ６.

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Mar 18, 2014

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２３８６

２０８０÷２０＝４商の見当をつける
２０商が大きすぎた４２３×４＝９２ × 　４ひけない
２０１小さくする４ ×
２０１小さくする３２３×３＝６９ × 　３
２０３６９ × 　３１７見当をつけた商が大きすぎたら，商を小さくします。
１２８１

１０８０÷１０＝８商の見当をつける
１０商が大きすぎた８１２×８＝９６ × 　８ひけない
１０１小さくする８９６ × 　８
１０まだ大きい７１２×７＝８４ × 　７ひけない
１０１小さくする７８４ × 　７
１０１小さくする６１２×６＝７２ × 　６
１０６ひけた！７２ × 　６９

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