tumblr via “kktcom: “北海道で生活する小学生は、気温を通して知らず知らずのうちに負の数を理解しています。” ? 『生き抜くための中学数学』|紙魚 (via sasakitakashi)” https://t.co/VqtuPcCMni



from Twitter https://twitter.com/itarunozaki

June 26, 2018 at 11:46AM
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