I made a game for Android, its about basic arithmetics 
I tried those “math workout online” or “quick math test online”, and it was challenging and fun, and I made one as well :). Idea was to make it to be more like game, and more visual, its not new, but my app have jazzy nice music 8) (Music by Our Music Box)
More details follows.
Challenge this game, with your basic math skill. You see the numbers falling in the box, and you making arithmetic operations with them, and the result of all arithmetic operations in the box.
There are three modes, and they have three difficulty levels, by clearing any level, you will see a grade on how well you did.
First “All Sum” mode. In this mode you are only adding numbers with each other and result in the box. Then “Timed”, this mode have a timer, and in this mode, you will add and subtract numbers. The third mode is “Math Box”, here you have added numbers, subtracting, dividing and multiplicating, but no timer.
Try every mode, and have fun with this game.
Game mostly for devices, but executable jar here as well
Amazon Appstore: Math Box
Get apk: Math Box
Executable Jar: Math Box