Dr. Arthur Benjamin is both a professor of mathematics and a magician. He has combined his two loves to create a dynamic presentation called "Mathemagics," suitable for all audiences, where he demonstrates and explains his secrets for performing rapid mental calculations faster than a calculator. If you haven't had the opportunity to see in person, watch him online, www.math.hmc.edu/~benjamin/mathemagics.htm.
Learn the secrets of how Arthur Benjamin calculates so quickly in his book or from DVDs that he sells. I showed part of a video to one of my math camps, and then we had fun trying to add and subtract two and three digit numbers in our heads.
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