Meteor Math ($0.99)
Players need “crash” meteors together to solve addition, subtraction, multiplication and division equations through increasingly harder problems. A great way to improve student’s rapid recall of number facts.

BallFallDown (free)
Students construct their own marble run using classic pieces like wooden boards and spinning stars, and discover never-before seen pieces like teleporters, spouts and many others! There are no points or levels to this game. Instead, students control gravity and the rate of the balls falling.