His bio reads:
Arthur Benjamin is a professor of mathematics at Harvey Mudd College in Claremont, California. A professional magician, Benjamin can also multiply large numbers faster than a calculator, figure out the week day of any date in history and has memorized the decimal numbers of pi out to 100 digits.Let's look at him teaching how to multiply by 11 quickly!
Secrets of Mental Math: The Mathemagician's Guide to Lightning Calculation and Amazing Math Tricks
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