This is a trick that can be used to multiply two numbers by drawing out lines and counting crossings. In this version you can use numbers with up to 3 digits. Try it out and see if you can do it yourself with 2 digits numbers. For example you can try 13 x 21. I know the counting a little slow. Try turbo mode if you get impatient (hold shift and click the green flag).
Credit to -Jie-.
