A Maths Dictionary for Kids [ Kids/Teens ] - An animated, interactive math dictionary defining common math terms and concepts. [Requires Flash 5] http://www.amathsdictionaryforkids.com/

A+ Math [ Kids ] - Helps students improve their math skills interactively with flashcards and games. Also provides worksheets and homework help. http://www.aplusmath.com/

Allmath.com [ Kids/Teens ] - Features free flashcards, a magic square game, biographies of mathematicians, and other resources. http://www.allmath.com/

Apples4theteacher.com [ Kids/Teens ] - Offers games on counting, telling time, making change, measurement, and shapes. http://www.apples4theteacher.com/math.html

Convertalot [ Kids/Teens/Mature Teens ] - A collection of free Java-based measurements converters, calculators, and unit translators. http://www.convertalot.com/

ConvertIt.com [ Kids/Teens/Mature Teens ] - Calculators for a variety of subjects, including measurement conversion, interest, distance, time zones, and currency. http://www.convertit.com/

Coolmath4kids [ Kids/Teens/Mature Teens ] - Math games, problems, calculators, puzzles, and fun and for all levels. http://www.coolmath4kids.com/

Cynthia Lanius' Fractals Unit [ Mature Teens ] - Explains the unusual concept of partial dimensions and shows comparisons to a dot, line, plane and cube. http://math.rice.edu/~lanius/fractals/dim.html

Dositey.com [ Kids/Teens/Mature Teens ] - Interactive lessons and exercises, open-ended questions, printable worksheets, and challenging problems sorted by topic and grade range. http://www.dositey.com/

Fact Monster - Math [ Kids/Teens ] - Learn about numbers, measurement, money, tables and formulas. Includes conversion calculator, games and quizzes. http://www.factmonster.com/mathmoney.html

Fugues of the Well-Tempered Clavier [ Teens/Mature Teens ] - Interactive Director movie comparing a fugue by Johann Sebastian Bach to a fractal. http://jan.ucc.nau.edu/~tas3/wtc/i16.html

Harcourt Math Glossary [ Kids ] - Animated and illustrated definitions of math terms for elementary school students. Organized by grade level and alphabetically. [Requires Flash] http://www.hbschool.com/glossary/math2/index_temp.html

If You Are Good at Math [ Mature Teens ] - Provides information on the kinds of jobs available for kids interested in math. http://www.bls.gov/k12/math.htm

Interactive Mathematics [ Kids ] - Online exercises through which children can explore and examine math concepts while at home. http://nlvm.usu.edu/en/nav/grade_g_2.html

Kids' Place: Roz's Math-o-Rama [ Kids/Teens ] - Features opinion polls, study tips, online math games, word problems, glossary, and interactive puzzles. Includes different sections for levels from kindergarten through the sixth grade. http://www.eduplace.com/kids/mw/

Math Flash [ Kids ] - Free downloadable flash card game for children aimed at improving their mathematics skills with lessons aimed at various age groups. http://www.huntingtonlearning.com/st-mathflash.php?

Math for Morons Like Us [ Teens/Mature Teens ] - Covers concepts that are used in algebra and geometry, as well as an overview of calculus terms. Includes explanations on how to use the number line, working with formulas, fractions, square roots, graphs, parallel lines, triangles and areas. Also has a message board and short quizzes. http://library.thinkquest.org/20991/home.html

Math Forum: Student Center [ Kids/Teens/Mature Teens ] - Ask Dr. Math questions, or try your hand at the weekly puzzlers. http://mathforum.org/students/

Math Goodies [ Kids/Teens/Mature Teens ] - Features interactive math lessons, homework help, worksheets, puzzles, message boards, and newsletters. http://www.mathgoodies.com/

Math Help: Exercises and Activities [ Kids/Teens/Mature Teens ] - Interactive activities and quizzes in basic arithmetic, algebra, and trigonometry. Also includes brain teasers and puzzles. http://www.syvum.com/math/