Mathematical addition and subtraction fast for a major challenge. Answered the faster the time, the higher the score Oh.
Simple mental arithmetic quiz games, 2 to 5 in the formula, the formula selected from [error] can be, there are four levels waiting for you to challenge oh
Click on the screen, so that all will pass into a black box. 999 off completely free, allowing you to enjoy smooth play.
Easy to play, fun to play, play anytime, you can enjoy to get better, you can readily pass through.