足し算引き算が爆速になる方法【計算が速くなる考え方】











>> YOUR LINK HERE: ___ http://youtube.com/watch?v=kf-5DYoBp3E

計算が速くなる方法をご紹介します。 • 足し算引き算の考え方を変えるだけで • 暗算速度がものすごく早くなるんです。 • 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