"1984年10月12日、大阪の小学校で1年生の担任である女性教諭が、担任する学級で繰り下がりのある引き算『15-8』の解法を教えていた。このとき、担任は「5から8を引くことはできないので、10の位から10を借りてくる」と教え、そのように計算を行った。このとき、10は借りてきたものであるから、当然10の位へ返還する義務が生じるのだが、担任は10を返却しなかった。このことを1人の男子児童が指摘したが、教諭はこれを黙殺した。"
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