Chima

Chima is a fun iOS app for wanting to reinforce students basic Math skills such as addition/subtraction. It's a fairly simple game where a user tries to answer a multiple choice Math question correct.  It uses a basic fighting/adventure/RPG style game where a correct answer attacks/hits the enemy causing them to lose hit points (HP).  The better a person does and they can level up.  There's also a nice feature to choose the monster you want to go against.

I recommend checking out Chima by clicking here.

To try out the browser version of the game click here.