Perennial Grey Matters favorite Arthur Benjamin is back! This performance is similar to what he does at his Magic Castle appearances, where you can see him from December 17 to 23. Here, you'll see him square 2-digit, 3-digit and 4-digit numbers faster than a calculator, divines several missing digits, gives the day of the week for any given date, and finishes by squaring a 5-digit number and letting you see the process!

You can find other videos featuring Dr. Benjamin here, here and here. If you would like to learn more about the art of mathemagic, the Grey Matters Store has an entire mathemagic section, and even features Dr. Benjamin's book, Secrets of Mental Math.

Video Format:
TED