こんにちは!「100日後にそろばん完全マスター!」の主です。 Youtube37日目の動画「暗算6級 2桁×1桁のかけ暗算」の内容を簡単に解説します。 第二章のそろばん10.9級編のかけ算のやり方をマスターしていれば、2桁×1桁のかけ暗算の計算もスムーズにできる ...
こんにちは!「100日後にそろばん完全マスター!」の主です。 Youtube17日目の動画「2ケタ×1ケタのかけ算練習問題」の内容を簡単に解説します。 2桁×1桁①〜⑤(12日目〜16日目)の学習が終わったら、一息ついた後にそろばん10.9級のかけ算の練習問題10問を ...
Ever wanted to impress everyone by solving complex multiplication problems in your head, without needing a pencil or paper? It's not magic; it's mental math—a superpower you can learn! This article is ...
19 is only 1 away from 20, so you prefer to start by multiplying 20 times 5, which equals 100. Then we need to take away a squadron of 5, because there are actually only 19 squadrons, not 20. 100 take ...
19 is only 1 away from 20, so you prefer to start by multiplying 20 times 5, which equals 100. Then we need to take away a squadron of 5, because there are actually only 19 squadrons, not 20. 100 take ...