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Tutorials, games, and simulations of mathematical ideas in science.
http://www.7stones.com/
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games, flashcards, and homework help for elementary students.
http://www.aplusmath.com/
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grades K-6. Flashcards for learning arithmetic, 'Ask the Experts' and math biographies.
http://www.allmath.com/
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international organization supporting the presentation, publication, and critical discussion of scholarly work in the field of logic.
http://www.aslonline.org/
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the annals of combinatorics.
http://www.combinatorics.net/
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features puzzles, fractals, games, lessons, calculators, and more.
http://www.coolmath.com/
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provides a description of ongoing work as well as an extensive collection of research reports and software for wavelets, filter design and algorithm development.
http://www.dsp.rice.edu/
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mistakes made over and over by advertisers, the media, reporters, politicians, activists, and in general many non-math people.
http://www.mathmistakes.com/
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seeks to promote and encourage interest in mathematics for everyone. Offers hands-on exhibits and workshops for all age groups.
http://www.mathmuseum.org/
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considers and publishes class-tested, web-based learning materials.
http://www.joma.org/
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features online construction of magic squares, history, and examples.
http://www.magic-squares.de/
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classified by grade and topic.
http://www.mathstories.com/
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offers help on grade school to college level math questions by live mathematicians. Large archive of answered questions and collection of detailed solutions.
http://www.mathnerds.com/
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features links to, and software for, building proofs in logic and set theory.
http://www.metamath.org/
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information related to multigrid, multiscale, and domain decomposition methods: preprints, tutorials, codes, monthly newsletters, and a large BibTex database.
http://www.mgnet.org/
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