脳を鍛える「計算」60日<4>(川島隆太教授の毎日楽しむ大人のドリル)

16.10 SGD
会員価格
14.49

Product Description

3つの数のたし算とひき算。簡単な計算問題をできるだけ解くことで、脳をしっかり活性化。

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