Park Math (PreK-1)
Children learn math concepts in a playground full of things to count. They'll love "pushing" the rabbit in the "swing" as they count to 50. Duck Duck Moose, $2.
Playful Minds: Math (2-3)
Kids hop from island to island to answer a new set of problems at each stop. There are 300 exercises and mini-games organized around concepts from algebra, geometry, and measurement.
Sushi Monster (4th & up)
This game turns your iPad or iPhone into a fast-paced addition and multiplication math-facts machine. Your job? Touch numbers that add up to the Sushi Monster's sum before time runs out. The better you do, the harder it gets.