頭の回転が速くなる2桁×1桁脳トレ！全２０問！暗算のコツ解説付きで誰でも簡単に挑戦できます！
Synopsis
2桁×1桁の計算をするシンプルな脳トレです。シンプルですが、メモ等をとらず、頭の中だけで計算すれば、脳を活性化する ...
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