You are about to play mental math games on CalculationRankings.com.When playing our games you will be redirected to our brand new website: Rankyourbrain.com!Besides mental math training, the new website also provides free access to IQ-test training and CFA training. Feel free to update your account and make use of additional free features, such as personal stats and create private groups to compete with.Enjoy yourself and lots of success! Go to the tests