How to Multiply
Japanese multiplication maths trick. How to multiply two numbers together using a simple visual lines diagram technique. Perfect to help anyone struggling with arithmetic. Larger numbers can also be
日本人傳出的"畫線乘法"，免背九九乘法表！
https://m.youtube.com/watch?v=VJf8XAhC550
帶孫的可以教金孫喔~
https://m.youtube.com/watch?v=VJf8XAhC550
帶孫的可以教金孫喔~
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Rosalind mark this message contains true information
｜originally written by Rosalind
確實有此方法。
References
http://www.appledaily.com.tw/appledaily/article/headline/20070125/3207008/趣味數學 劃線算乘法 | 蘋果日報
網路影片【周恩華╱綜合報導】網站上出現了一種看似毫無章法，卻內含數學原理的乘法教學方法。影片中，首先示範計算21x13的乘式，先劃幾條線，然後計算交點的數目，如同變魔術般的，就寫出了正確答案273。再以123x321為例，同樣「劃」出了答案39483。 運用圖形表徵計算記者以35x14與23x32測試都成功的劃出了答案，讀者可依影片示範的方法測試。台師大數學研究所楊伯軒表示，這是運用「乘法的圖形表
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