Untitled
■実際の計算

　９９９９　＋　１　＝１００００
　３４５２

　↓↓↓↓（反射的に置き換え）

　６５４７（減基数の補数）　＋　１　＝　６５４８（基数の補数）

　何桁の引き算だろうと、最も上の位から十の位までは、自動的に置き換えることで済む。
　一の桁だけ、プラス１することを忘れなければよい。
　さらに良いことは、上の桁から計算ができるので、口頭で数字が与えられた時でも、数字を読み上げられているさなかに計算が開始できるので、数字を一旦アタマの中に蓄えなくても計算できる。
　おかげで、これまたワーキング・メモリを消費しなくて済む。
“
— １０秒で覚えられて計算がバツグンに速くなる方法 読書猿Classic: between / beyond readers (via yuria) (via otsune) (via yu5yam) (via theemitter) (via yukko) (via yaruo)
Reblogged 2 years ago from yaruo (Originally from ginzuna)
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Source: ginzuna
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