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Recognized as the father of analytic geometry, René Descartes was a French mathematician and philosopher. Kids will love this funny and very accessible tale - based on one of math's greatest myths - about the man who popularized the Cartesion system of coordinates.
On a beautiful summer day a young girl sets up a lemonade stand and sells enough cups of refreshment to add up to a dollar. Told in rhyme, this delightful story combines the teaching of addition with a traditional rite of childhood entrepreneurship!