I would like to recommend you an application with large number of downloaders. 20,000+ users downloaded LCM-GCD Calculator latest version on 9Apps for free every week! It is the app that defined the best for a generation. This hot app was released on 2015-09-25. Be sure that you check your current app before you start a run.
The application calculates the lowest common multiple (LCM) and the greatest common divisor (GCD) of 2 to 5 integers. It gives students in schools the possibility to check their homeworks.