coolmath

cool math has free online cool math lessons, cool math games and fun math activities. really clear math lessons (pre-algebra, algebra, precalculus), cool math games, online graphing calculators, geometry art, fractals, polyhedra, parents and teachers areas too.

coolmath games is a brain-training site, for everyone, where logic & thinking & math meets fun & games. these games have no violence, no empty action, just a lot of challenges that will make you forget you're getting a mental workout!