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Allmath.com
[ Kids/Teens ] - Features free flashcards, a magic square game, biographies of mathematicians, and other resources. http://www.allmath.com/
[ Teens ] - Learn how to use expressions to represent numbers, work with variables and create special drawings to represent equations. Also has a brief introduction to trigonometry and curve fitting. Includes interactive graphs.
[ Kids/Teens/Mature Teens ] - Interactive activities and quizzes in basic arithmetic, algebra, and trigonometry. Also includes brain teasers and puzzles.
[ Kids/Teens/Mature Teens ] - Introduces the abacus, relates its history, and shows how to perform basic mathematical operations on it. Also answers questions about the ancient tool and shows how to build one with Legos.