△小中学生現役塾講師が家庭教師します。1時間1400円。不登校児1000円 [旧浜松市内]・youtube・https://www.youtube.com/channel/UCR7yI7iJRJ6rNBWI9wCeHQg

二乗の数の覚え方(11から19)

カテゴリー │算数・数学

カテゴリー │小学校

11×11=121 いいいい、人に人
12×12=144 胃に胃に石よ
13×13=169 いざいざ、イチロー君
14×14=196 ドシドシ、一苦労
15×15=225 イチゴイチゴにニコッ
16×16=256 イロイロ煮込む
17×17=289 ドナドナ二拍 いーないーな二泊
18×18=324 イヤイヤ、ミニよ
19×19=361 イクイク、寒いとこ

 円の面積や平方根の計算に便利です。相手が寒いダジャレを言ったときに「19×19」と言いましょう(寒いから)と生徒に言っていたら、テレビのドラマで[19×19=361}が出てきたようです。数学は苦手でも、それは忘れないとのことです。

映像
2乗のかけ算、11から19
https://www.youtube.com/watch?v=cxRlu22yMX4

二乗の数の覚え方(11から19)

二乗の数の覚え方(11から19)
yokoさん画

同じ数を二回掛けることを二乗と言います。二乗の掛け算を覚えると、素因数分解、円、正方形の計算、三平方の定理、ルートの計算などに役立ちます。

19×19までの2ケタの掛け算

一級いー句 http://tensaimuraki.hamazo.tv/e4333383.html

3.14の九九、かけ算の覚え方
http://tensaimuraki.hamazo.tv/e6608363.html

世界の国名と首都名覚え方
http://tensaimuraki.hamazo.tv/e6796889.html

中学英単語覚え方ノート


中学歴史年号語呂合わせ



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