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８０ ÷ ２０＝

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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８０ ÷ ２０＝

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  1. ２３ ８６

  2. ２０ ８０÷２０＝ ４ 商の見当をつける

  3. ２０ 商が大きすぎた ４ ２３×４＝ ９ ２ × 　４ ひけない

  4. ２０ １小さくする ４ ×

  5. ２０ １小さくする ３ ２３×３＝ ６ ９ × 　３

  6. 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。

  7. １２ ８１

  8. １０ ８０÷１０＝ ８ 商の見当をつける

  9. １０ 商が大きすぎた ８ １２×８＝ ９ ６ × 　８ ひけない

  10. １０ １小さくする ８ ９ ６ × 　８

  11. １０ まだ大きい ７ １２×７＝ ８ ４ × 　７ ひけない

  12. １０ １小さくする ７ ８ ４ × 　７

  13. １０ １小さくする ６ １２×６＝ ７ ２ × 　６

  14. １０ ６ ひけた！ ７ ２ × 　６ ９

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