Another random math skill unlocked. While delving on how to speed up my multiplication like it’s muscle memory without the need to say “8, 16, 24,” I figured I’d need some trick. But really, there’s ...

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 ...

Napier’s method of multiplication is a method used to multiply large numbers when you do not have a calculator. Draw a 2 by 2 grid to multiply a 2-digit number by another 2-digit number. Label the ...