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Mathematics and culture are two things seen as something that is not connected to everyday life. Whereas in teaching mathematics in school (formal), the teacher should start by exploring the knowledge of informal mathematics that has been obtained by students from the lives of the people around their homes. Environment can be a source of mathematical problems in real life. One of the environments is culture. Mathematics in culture is known as ethnomatematics. Each region certainly has its own culture, including Jakarta. Jakarta which is the capital city of Indonesia has a culture of traditional houses known as Rumah kebaya. Rumah kebaya has a special characteristic, especially on the roof which consists of a triangle and a trapezoid. The purpose of this exploratory research with ethnographic approach is to explore and explore any mathematical concepts that exist in rumah kebaya which can be used as a learning resource for mathematics as well as an effort to develop ethnomatematics as the basis for mathematics learning. Learning mathematics using ethnomatematics objects can enrich the mathematical applications that are around students and can facilitate students to understand abstract mathematics by using concrete ethnomatematics objects.