Apps > Math-o-Mat
Math-o-Mat is a one or two-player iOS game that helps you practice arithmetic.
Math-o-Mat is like Ping Pong, except instead of a ball, you will have to hit back arithmetic problems.
When the game starts, pick the operator you want to practice and change the game's background color. Pick the one or two player version. Then, tap play when you are ready.
Math-o-Mat is open sourced on GitHub https://github.com/app-o-mat/MathOMat