A few new math apps we love (for the ipad; some are also available for the iphone/itouch), thanks to recommendations from our school's technology teacher:
Operation Math - focused on basic operations but in a fun way that has a lot of motivation built in. A spy theme, which is very catchy and fun! A polished game-like way to practice.
Math Bingo - a slower and lower key way to practice basic math facts using bingo. Highly rated and recommended by several sites from kids to grandparents.
Mathemagics - a tutorial style approach to learning short cuts and the magic behind numbers. May need an adult to help explain and walk through some of the problems.
Skynumbers - a challenging, fun way to use mental math in a game setting and sharpen those skills very quickly before items fall to the ground from the sky!