The development of a mobile phone application based on RME model for probability of union of two events

This research is the third of three years fully funded and supported by the National Research and Innovation Agency for the 2019-2021 fiscal year. This study resulted in a mobile learning application design for the probability of the union of two events based on the RME model on mobile devices. The reference for developing this application is an RME-based high school mathematics learning guide book, especially probability material. Application development goes through nine stages, namely: (1) storyboard design; (2) graphic design; (3) animation design; (4) voiceover design; (5) animation video design; (6) consultation with mathematics education experts and teachers; (7) first revision based on suggestions and input from mathematicians and teachers; (7) trial use of the application on several students; (8) second revision based on student input. The average scores of two experts and two mathematics teachers were 93 for display, 89 for text, 94 for device engineering, and 87 for sound. Both teachers and their students love to use this app for learning. The final product of the research is an application that is available for free on the Google PlayStore and can be downloaded at: https://play.google.com/store/apps/details?id=com.uhamka.application_rme.