Coolmath has a ton of cool math games and puzzles, lots of really clear math lessons (arithmetic, fractions, decimals, algebra, etc.), fractals, geometry, tessellations and more. Tons of very cool math stuff for kids, teens, parents and teachers too!
- Maths is Fun
Math explained in easy language, plus puzzles, games, quizzes, worksheets and a forum. For K-12 kids, teachers and parents.