(hard setting — it can go much easier. 😉 )
Here’s an Open Source (and FREE!) math game geared for kids. Tux, of Math Command, or Tux Math for short. Comets blaze down with math problems on them, and kids have to punch in the answer before they clobber four poor penguins huddling for shelter beneath igloos.
Yes, it sounds weird. But with the various training options and such, we were able to give Mo number typing help (no math, just find the numbers) as well as gearing the game to C’s basic math skills. The fact that there’s a time limit helps to reinforce quick thinking about basic sums.
Give it a whirl. Let us know what you think!