Math.com

Offers free math lessons and homework help, with an emphasis on geometry, algebra, statistics, and calculus. Also provides calculators and games.
http://www.math.com/

Math Worksheets

Features printable worksheets for students to practice with.
http://www.teach-nology.com/worksheets/math/

Coolmath4kids

Math games, problems, calculators, puzzles, and fun and for all levels.
http://www.coolmath4kids.com/

A+ Math

Helps students improve their math skills interactively with flashcards and games. Also provides worksheets and homework help.
http://www.aplusmath.com/

Mathsforkids

This site has been created so that students can have fun and practice math. Includes lessons in addition, subtraction, multiplication, geometry.
http://www.mathsforkids.com/

Allmath.com

Features free flashcards, a magic square game, biographies of mathematicians, and other resources.
http://www.allmath.com/

Math Help: Exercises and Activities

Interactive activities and quizzes in basic arithmetic, algebra, and trigonometry. Also includes brain teasers and puzzles.
http://www.syvum.com/math/

ConvertIt.com

Calculators for a variety of subjects, including measurement conversion, interest, distance, time zones, and currency.
http://www.convertit.com/

Dositey.com

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

Plot the Robot

Activity site involving multiplication and calculator work. The answers are coordinates which can be joined in sequence to generate simple pictures.
http://www.jcutting.freeserve.co.uk/

Teach R Kids Math

A large collection of interactive worksheets that allows kids to practice basic math skills.
http://www.teachrkids.com/

The Abacus: The Art of Calculating with Beads

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

Math in Daily Life

Virtual exhibit looks at the ways people use math every day, from cooking to planning for retirement.
http://www.learner.org/exhibits/dailymath/

Maths on the Web

Collection of exercises and puzzles for all ages and abilities.
http://www.members.aol.com/ukhostmths/mathson/mathson.htm

Math Goodies

Features interactive math lessons, homework help, worksheets, puzzles, message boards, and newsletters.
http://www.mathgoodies.com/

Ribbit's Math Ventures

Math problems that tell a story about a frog named Ribbit. For K-8.
http://www.mohonasen.org/staffdev/mathven/Ribbit/rdefault.htm

Math Forum: Student Center

Ask Dr. Math questions, or try your hand at the weekly puzzlers.
http://mathforum.org/students/

A Maths Dictionary for Kids

An animated, interactive math dictionary defining common math terms and concepts. [Requires Flash 5]
http://www.amathsdictionaryforkids.com/

Math Flash

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?

Powers of Ten

Produced by Charles and Ray Eames, the video "Powers of Ten" has been converted into web images. Explores over 42 powers of ten in a series of images, beginning with a photo of someone lying on the grass. Shows the scale of the universe and atoms.
http://www.wordwizz.com/pwrsof10.htm

Mathematics Magazine for Grades 1-12

Monthly publication offering math help, list of competitions, and links.
http://www.mathematicsmagazine.com

Math Enrichment Problems

Online problem sheets for kindergarden through Algebra II. Also provides more advanced Math Stumpers.
http://www.saxonhomeschool.com/activities/enrichment/index.html

All Elementary Mathematics

An online mathematical high school. Arithmetic, algebra, geometry, trigonometry, functions and graphs, analysis. Theory and solving problems. Also has practice exams and math jokes.
http://www.bymath.com

Fact Monster - Math

Learn about numbers, measurement, money, tables and formulas. Includes conversion calculator, games and quizzes.
http://www.factmonster.com/mathmoney.html

Themathlab.com

A collection of educational math games and lessons for pre-algebra, algebra, and geometry. Includes practice problems and drills, a math dictionary, and a humor section.
http://www.themathlab.com

Mathwizz.com

Interactive worksheets and quizzes in basic math, pre-algebra, algebra, geometry, and statistics. Find calculators to compute interest and conversion tools for currency, area, temperature, and other units of measurement. Also runs a weekly math contest.
http://www.mathwizz.com

MathBlues

Articles, discussion groups, and news that aim to show high school students the fun, creative side of math. Also provides SAT tips and homework help resources. Encourages submission of writing and artwork by students.
http://www.mathblues.com

Fugues of the Well-Tempered Clavier

Interactive Director movie comparing a fugue by Johann Sebastian Bach to a fractal.
http://jan.ucc.nau.edu/~tas3/wtc/i16.html

MathStories.com: Word Problem Solving Strategies

Tips for solving word problems for K-5th graders.
http://www.mathstories.com/strategies.htm

More Mathematics than Science

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.
http://id.mind.net/~zona/mmts/mmts.html

Kids' Place: Roz's Math-o-Rama

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/

Harcourt Math Glossary

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

Maths Is Fun

Includes lessons, games, puzzles, and offline activities.
http://www.mathsisfun.com/

Cynthia Lanius' Fractals Unit

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

Word Problems For Kids

Have fun solving problems concerning rates, measurements, shapes, money, fractions and time. Page includes hints and solutions.
http://www.stfx.ca/special/mathproblems/

Pi R Squared: Fractals

Explains the properties of fractal graphic images that can be created with special formulas. Also, introduces chaos theory and infinity. Offers free online help.
http://www.freewebs.com/pirsquared/fractals.htm

Math for Morons Like Us

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 m
http://library.thinkquest.org/20991/home.html

Online Math Applications

Explains the role of math in investing, music, history, science, and travel. Includes stock simulation game.
http://library.thinkquest.org/4116/

Convertalot

A collection of free Java-based measurements converters, calculators, and unit translators.
http://www.convertalot.com/

Interactive Mathematics

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

Apples4theteacher.com

Offers games on counting, telling time, making change, measurement, and shapes.
http://www.apples4theteacher.com/math.html

If You Are Good at Math

Provides information on the kinds of jobs available for kids interested in math.
http://www.bls.gov/k12/math.htm