https://play.google.com/store/apps/details?id=com.kkml.Mathemator Mathemator is a simple math game, that sets you to challenge yourself and improve your arithmetic and calculation capabilities. One can practice addition, substraction, multiplication, and division. -You can play against a number of questions and enhance the time it takes you to answer them. -or try to answer as much as you can in one minute time. All with changing the difficulty of the questions. At the end you get a history of the scores and the performance achieved. Play hard and have fun !!