Qompute! - Math puzzle

Find the calculation as fast as you can! Practice your mental math skills with this simple but addictive calculation game. Unlock Achievements and compete on the global and social Leaderboards via Google Play. * HOW TO PLAY * It is kind of a math puzzle and quiz at the same time. The goal is simple: score as many points as you can by finding valid calculations given a mathematical operation. You see 9 squares that contain a number. An operation (multiplication, division, addition, subtraction) appears at the top -- for example, a “ ”. You must find a valid sum in the form A B = C before the timer runs out. You do this by tapping the 3 numbers in the order they appear, for instance “21”, “15” and 36”. Some of the times you will find these quickly, but occasionally it will take some math skills to find a solution. The quicker you find a right answer, the higher your awarded time bonus will be. But watch out, you will get a time penalty for something that does not compute! After each round, the chosen numbers will be replaced by 3 new ones. (The numbers are not entirely random -- there is always a solution.) Also, each round you will get a bit less time to find the solution and obviously the values on the grid will rise as you complete more rounds. They will not go above 99, so you don't need to be a math wizard (although it helps). Once you run out of time the game is over. It seems simple, but it takes quite some mental arithmetic to get to the right answer, so it is ideal for training your own (or your kids) mental math skills.