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offers interactive converters for distance, area, volume, mass, time, velocity, force, pressure, energy, power, density, flow, luminance, illuminance, temperature, and angles.
http://www.1728.com/
PageRank: Not available
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offers paradoxical designs, puzzles, poems, and ideas.
http://www.curiouser.co.uk/
PageRank: Not available
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interactive mathematics miscellany and puzzles.
http://www.cut-the-knot.org/
PageRank: Not available
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offering geometry, logic, math, weight and other categories.
http://www.freepuzzles.com/
PageRank: Not available
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creative, open-ended math explorations for children. Also includes cat and dog stories.
http://www.mathcats.com/
PageRank: Not available
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celebrates math puzzles and mathematical recreations.
http://www.mathpuzzle.com/
PageRank: Not available
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problems and help for K-12, loan and mortgage calculators, and fun links.
http://www.mathwizz.com/
PageRank: Not available
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free automated service which provides solutions to all sorts of common mathematical problems within a couple of seconds.
http://www.quickmath.com/
PageRank: Not available
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provides math problems, brainteasers, and riddles online. These puzzles aid in developing problem solving and lateral thinking skills.
http://www.theproblemsite.com/
PageRank: Not available
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dedicated to John Conway's thrackle problem.
http://www.thrackle.org/
PageRank: Not available
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