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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. |
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| Google PR |
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| offers paradoxical designs, puzzles, poems, and ideas. |
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| Google PR |
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| interactive mathematics miscellany and puzzles. |
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| Google PR |
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| offering geometry, logic, math, weight and other categories. |
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| Google PR |
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| creative, open-ended math explorations for children. Also includes cat and dog stories. |
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| Google PR |
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| celebrates math puzzles and mathematical recreations. |
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| Google PR |
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| problems and help for K-12, loan and mortgage calculators, and fun links. |
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| Google PR |
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| free automated service which provides solutions to all sorts of common mathematical problems within a couple of seconds. |
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| Google PR |
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| provides math problems, brainteasers, and riddles online. These puzzles aid in developing problem solving and lateral thinking skills. |
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| Google PR |
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| dedicated to John Conway's thrackle problem. |
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| Google PR |
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