工夫 ひし型の面積の理解
ひし形の面積について。5年生から面積を求める問題が多い。三角形、平行四辺形、台形、ひし形。 ポイントは四角で囲むことだと思う。解き方はぴったりトレーニングの例題に書いてあるけど、やっぱり初学者には一回だけではわからないと思う。だから、こうい...
ゆる早期教育ブログ
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