MATHCOUNTS® is a national math enrichment, coaching and competition program that promotes middle school mathematics achievement through grassroots involvement in every U.S. state and territory. After several months of coaching, participating schools select students to compete individually or as part of a team in one of the more than 500 written and oral competitions held nationwide and in U.S. schools overseas. Winners at the local level proceed to state competitions, where the top 4 Mathletes® and top coach earn the right to represent their state or territory at the national level. At all levels, MATHCOUNTS challenges students' math skills, develops their self-confidence and rewards them for their achievements. Students enrolled in the 6th, 7th, or 8th grades are eligible to participate in MATHCOUNTS competitions.

HomeschoolMath.net is a comprehensive math resource site for homeschooling parents and teachers: find free worksheets, math ebooks for elementary grades, an extensive link list of games, a homeschool math curriculum guide, interactive tutorials & quizzes, and teaching tips articles. The resources emphasize understanding of concepts instead of just mechanical memorization of rules.

This collection of online games offers math games for grades 1-6.

MathRider combines fun math game play with a highly sophisticated question engine that adapts to your child. The game propels your child to mastery of all four math operations using numbers 0 to 12 in record time.

This brain training site is where logic and thinking meet fun and games. These games feature lots of challenges that will make you forget you are getting a mental workout.

This website features online games and interactive activities designed to help children learn and understand mathematical concepts. You can choose any grade level from pre-K to 12, and subjects including numbers and operations, algebra, geometry, measurements, data analysis, and probability. You'll find virtual peg boards, geoboards, fractals, charts, games, and much more.

This wonderful blog is written by a homeschooling mother who wants to make learning math fun. It is a place where you can learn about new ways of learning, teaching, and understanding math. Math is a game, playing with ideas. This blog is about the ongoing adventure of learning, teaching, and playing around with mathematics from preschool to precalculus.

This is a huge collection of online math games for preschool and elementary aged kids.

Homeschooling parents will find that when it comes to choosing the curriculum for math, there is a huge variety available. In fact, the number of math curriculums available to choose from may make choosing the right one difficult. These supplemental math activities for grades K-5 are fun ways to incorporate more math into your homeschooling.