Hungry Fish is an iPad, iPhone, and iPod app for kids (or even adults) that can be used to help improve player’s skills in mental mathematics.
The player is given a fish, a fish that is hungry with numbers that needs be to fed.
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King of Math is a great fast-paced game for improving skills in mental mathematics. The free version includes questions in addition and subtraction and a mixed of both. The full version ($0.99) on the other hand, includes questions on Multiplication, Division, Geometry, Fractions, Powers, Statistics and Equations.
In King of Math, the player starts as a farmer and improves as the level goes up; for example, after level 1, he becomes a merchant. The score of the player depends on how fast he can answer the questions at each level. The slower the answer, the smaller the score.
What I like about King of Math is the variety of exercises available. For instance, in subtraction, it does not just ask for the difference; it also asks for the minuend or subtrahend. This will make the player thinking under time pressure.