Brain Activation

You do a sum in your head, and show your brain Powerquot;Brain Activationquot; is a calculation game which you do a sum in your head as soon as possible.Enjoy calculation and know your brain powerThere are three levels with a different difficulty.First of all, let39;s test your power from an easy level, and let39;s try to harder level after thatOr, do you challenge at the most difficult level at first?This game has international and domestic ranking. Complete all questions, and send the score of time that you take.Can you put your name on the leaderboard also?