Line Multiplication Explored and Explained

Every few years "Line Multiplication" or "Japanese Multiplication" (or some other name for the method) makes the internet rounds. It is a curious approach to conducting long multiplication and it is fun to try to make sense of this beautifully quirky--and not exactly efficient (but who cares?)--method.

[@euclid1618]

"keep track of your zeroes" ... words to live by

[@yoniskhalif7406]

James Taton. Thanks for your efforts. I watched your courses for the great courses. Please record another 3rd course.

[@lornacy]

This is a cool shortcut! I had never seen it before now.
You are such a joy to watch, and your explanations are so clear and effective! ❤