There are a gazillion games out there to learn addition or multiplication facts. There are very few, however, to learn about the quadratic formula. If you’re looking for some games to help your student practice math skills like fractions, prime factorization, angles, factoring polynomials, percentages and other math concepts under-served by the other math games sites, check out Manga High. The games are nothing brilliant or cutting edge, but they do cover a lot of ground that other games don’t. Between this site and Math Snacks, you should be able to find a game for just about any math topic through trigonometry! There is a rather pricey paid option that gives you more tracking ability, but the games are free.