Math Sums is a great educational game for kids (but adults can play as well).
In the top-left corner of the screen there is a number in there.
At the bottom you will see a 4x4 matrix with different numbers placed at it. Your goal is to swipe your finger through different numbers in the matrix so the sum of these numbers match the top left number.
Sounds easy? So have a try! Keep your finger on screen and slide to the next number....the sum of the numbers needs to match the top one!
This game is compatible with iPad,iPod and iPhone and has Gamecenter functionality.