Busted! is an exciting, fast paced, and inexpensive game you can make that your kids will love to play. It works best for 2-5 people to practice addition or multiplication facts.
Someone suggested this site to me. MathABC: Free Online Math Practice for Grades 1-6. Mark Sanders, the founder, says that he is in the process of adding hundreds more exercises but I have to say that what is up now is pretty great! And did I mention that it’s FREE?!!