Brain training,math puzzlegame

Arithmetic bubble is a brain training math game to complete the formula by selecting the sign and the number of bubble And trying to complete a formula in time! Six of difficulty Practice classroom, Novice School, Intermediate School Senior classroom, master classes, professional classroom It is equipped with a ranking system in each classroom. Let Kitaeyo the brain with brain training a little free time! "How to Play" 1: ＋、ー、×、÷　Choose the sign 2: choose a number that was in the sign