Exploration of Ethnomathematics at Rumah Gadang Minangkabau to Design Mathematics Learning Based on RME in Junior High Schools

In the Rumah Gadang Minangkabau architecture, various aspects of Ethnomathematics can be raised as real and exciting mathematics learning topics. These aspects have not been well explored and documented. This study aims (1) to explore the mathematical ideas contained in the construction and design process of the Rumah Gadang Minangkabau, (2) to design mathematics-learning tools based on realistic mathematics education (RME) sourced from Ethnomathematics at the Rumah Gadang Minangkabau. The study uses a combination of ethnographic and design research. Ethnographic research has explored Ethnomathematics in building and designing a Rumah Gadang in Minangkabau (covering Darek , coastal, and Rantau areas). Data collection techniques at this stage: in-depth interviews with key informants (Senior Builder, Carvers, Ninik Mamak , Traditional Leaders, and others.), observations, and manuscript analysis. The identified ethnomathematics aspects are integrated into the RME-based learning tool using design research, consisting of a preliminary phase, a prototyping phase, and an assessment phase. The RME-based learning design prototype has been validated by several experts (RME and Ethnomathematics experts, learning technology, and languages), and practitioners through focus group discussion (FGD) activities. Furthermore, the learning design was evaluated formatively (one to one and small group) to investigate its practicality. The collected data were analyzed using descriptive and inferential statistics.