Scientific American presents Math Dude by Quick & Dirty Tips. Scientific American and Quick & Dirty Tips are both Macmillan companies. After all of the fun we’ve had recounting the tales of Knot Dude, Papa Knot, seafaring pyramid builders, and the loads and loads of algebraic goodness they all used in their adventures, it’s time to shift our attention elsewhere for a while and talk about some practical and easy techniques that you can use to do simple math in your head…and to do it fast!
http://www.scientificamerican.com/article.cfm?id=how-to-square-numbers
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