This app isn't in any of our charts yet.
Mathematical problems to train the brain
Various math problems to improve calculation skills. There is also a task for returning change - money handling training. So far just addition and subtraction.
Not enough data yet.
Google Play only. Downloads from daily Top free ranks (or the store's install count); in-app revenue from Top grossing ranks, calibrated on AppTweak's US estimates, or else from downloads; ads from public ad benchmarks. Not reported figures.