暗算
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PASS:
これいいね♪2桁の掛け算はどうしても筆算もしくは電卓の私でもできそう☆姫にも教えてあげよかな。
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PASS:
＞p☆mamaさん
使えるでしょ。
姫が学校で使うと友達にびっくりされるよ。
もちろん、種明かしはせずに（笑
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PASS:
２桁と書いてありますが、10の位が1でないと成立しませんよね？
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PASS:
＞bellさん
ご指摘の通りです。
修正しました。
ありがとうございました。