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掛け算の暗算方法(図式解法-4)

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Uploaded by on Feb 19, 2007

掛け算を暗算する為の図式解法。

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  • 筆算したほうが速いわ

  • 良く分からないです。

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All Comments (9)

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  • IT SUPPOSE TO MEAN SOMETHING....LIKE THE PRIME NUMBERS LINEUP?

  • I dont get it with the circles and lines

  • 電卓使ったほうが速い

  • 不思議だな~

    だけどこの方法で暗算(頭の中だけで計算)するのは難しいと思う­。

  • なんでこういう形で解けるのだろう・・

    この前の棒で計算していくのもそうだったんですが・・そう考える­と普通の筆算もそうなのでしょうか?

  • 遅い!笑

    12*34=(12*30+ 12*4)=360+48=408

  • Zomg... Why didnt they teach us that in school?

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