Math Guinness is an app developed for people who want to try braking math world guinness records.
Speed Math - Human CalculatorForget about calculator, you no longer need it....
This app is no longer maintained please refer to this new app:https://play.google.com/store/apps/details?id=com.humancalc...
Stop on red game....
Multi Stopwatch and Timer is an extension of normal stopwatch and timer...
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