Realistic Mathematics Education Based on The Ethnomathematics in Rumoh Aceh

Mathematics plays a very important role in everyday life, we cannot imagine how difficult the lives of our students will be in social life if they do not understand mathematics well. Therefore, in learning mathematics in schools should begin with the introduction of problems related to daily life or culture in the area. This study aims to explore ethnomatics in Rumoh Acehin learning geometry for flat mangun material. The research method used in this study is qualitative with an ethnographic approach. The sampling technique uses purposive sampling. The subject of the study was a grade 3 student of Sekolah Alam Bireuen (SABIR) which is located in Bireuen Regency. Data was collected using conservation techniques, and interviews. Data analysis techniques through observation in the form of checks about activities while in Rumoh Aceh, and data analysis for interviews where during the interview will be asked questions about what things can be explored from Rumoh Aceh related to flat building material. The results showed that in geometry learning, abstract flat building material can be presented to a more concrete culture, namely Rumoh Aceh. This study found that there is ethnomatics in Rumoh Aceh building in geometry learning, especially flat shapes (square, square, triangle, parallelogram, and rhombus) taught with RME. Through this, students can know that there is an interrelated unity between mathematics learning in the context of Rumoh Aceh culture.