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 66 x 71. I know the counting a little slow. Try turbo mode if you get impatient.
Credit to Jie, I added troll face UPDATE: Removed troll face
