The purpose of this research and development was to improvea quality of teaching mathematic material of integer, KPK, and FPB. Location of the research was in the SDN Metro centre, east, south, north, and west. Subjects were fifth grade elementary schools' students and teachers. Steps of of the research were: preeliminery study; development of RME model, and test the RME model. Data was collected by teachers and students' activity instruments, media, questionnaire, and test. The collected data was analized by qualitative and quantitative analysis. The research found teaching Realistic Mathematics Education model improved students' activities and learning outcomes. Students' learning motivation positively increased and also their achivement increased.