Realistic mathematics education approach on teaching geometry in primary schools: Collaborative action research

The purpose of this study was to describe the steps of implementing the Realistic Mathematics Education (RME) approach in teaching geometry in elementary schools. This research uses collaborative action research between lecturers, students, and teachers in 2019 at one of the primary schools in Central Java. Data collection techniques through observation, interviews, and tests. The result of the research is that the implementation steps of the RME approach include: (a) Understanding contextual problems. (b) Describing contextual problems, (c) Solving contextual problems, (d) Comparing and discussing answers, and (e) Concluding. The implementation of the RME approach is proven to improve mathematics learning outcomes about geometry.