Mental Calc app for iPhone and iPad

Do you not fall computing power these days?
Best for you such this app!

"Mental Calc" In a nutshell the game is mental arithmetic.
The addition in ones head in sequence numbers that appear on the screen, please answer.

There are two modes in this game.
You can take it easy mental arithmetic training: training mode. I play well with children because you can set the number of digits and the speed is also slow eye!
It is a mode to compete for the number of seconds to answer: Challenge Mode. Number of seconds will be registered in GameCenter. Alright! Will aim at the top ranking!

The way to work, to kill time, not enough time, I will try to strengthen the force in mental arithmetic homework with this app!