I have taught a series of lectures on the Trachtenberg method in high school. It has some cute tricks, but really this is not mathematics, it's arithmetic. Don'

I have taught a series of lectures on the Trachtenberg method in high school. It has some cute tricks, but really this is not mathematics, it's arithmetic. Don't waste your time with it. If you're interested in maths, study maths not mental arithmetic. I promise it is much more interesting.