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http://themathworksheetsite.com/

http://www.aaamath.com/

http://www.algebrahelp.com/calculators/equation/proportions/

http://www.amathsdictionaryforkids.com/

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http://www.dis.dpi.state.nd.us/west/classes/math/ndsu/math/lessons_lectures.html

http://www.dositey.com/math/money.htm

http://www.edu4kids.com/index.php?TB=2&page=12

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http://www.ee.ryerson.ca:8080/~elf/abacus/

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http://www.zweigmedia.com/ThirdEdSite/tut_alg_review/framesA_4.html