I came across this website while surfing this evening. The site is for an online math tutoring service. They also sell a program that teaches how to do mental math faster than a calculator. Watching these videos made me miss my late father as he used to spend hours with me teaching me all sorts of little mental math tricks.
Here are two of their promotional videos. I think I might have to invest in this program.
Weekly Wrap-Up: The one after prom
2 days ago