Arthur Benjamin has been doing math magic for some years now, and is one of several mathematicians writing engaging books on their subject for the lay person. (See John Allen Paulos and William Dunham for two other excellent examples.) In this particular tome he shows off a number of mathematical tricks that make learning number concepts easier, including algebra, counting, fibonacci numbers, pi, calculus, and infinity.
Highly recommended, particularly to teachers - this gives you a lot more ammo than the average blah textbook.
I got a free copy of this book in exchange for a review on NetGalley.com.
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