muro1007

「じゅういくつ x じゅういくつ」のかけ算に使える「焼肉じゅうじゅう」方式のかけ算などがあります。

「17 x 18」を焼肉じゅうじゅう方式で計算した場合

17に8（「18」の一の位）を足して「25」
これにゼロをつけて「250」
一の位どうしをかけて、7 x 8 = 「56」
これをさっきの「250」と足して、答えは「306」

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— 2ケタのかけ算もすぐできる？知っておきたい「暗算テクニック」 - はてなブックマークニュース (via yellowblog) (via otsune) (via ktsujichan)
Reblogged 2 years ago from ktsujichan (Originally from yellowblog)
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Source: yellowblog
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