Math-Play.com Whether you are a student, parent, or teacher looking for free online math games, Math Play tries to provide you with fun and interactive math games that you can use at home, at school, or anywhere you have access to a computer with Internet connection.
Prodigy- Fun math games that are engaging and fun
Cool Math Games - Cool Math Games For Kindergarten Through Sixth Grade. Topics Range From Addition, Subtraction, Multiplication, Division, and Fractions.
Their first site! Coolmath.com offers "math for ages 13-100" -- explanations that are easy to grasp on topics like algebra, pre-calculus and more. (The owner started their career as a math teacher, so it's a great pleasure for them to help people finally understand -- and even enjoy! -- doing math.)
This is their brain-training site, for everyone, where logic & thinking 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!