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Mathematics taught in school is known as school mathematics where the study of material has been adjusted to the needs of students. Nonetheless, Mathematics is actually indirectly known in the community. Indirectly the community has known mathematics in their daily activities such as counting, measuring and even producing products such as woven. This habit is a culture that can be associated with mathematical concepts better known as ethnomatematics. One example is the concept of the roof of the kebaya house which is a traditional house of Jakarta. The roof of the house consists of a triangle and a trapezoid. This can indirectly introduce the concept of flat wake to students. This study aims to design learning media applications with mathematical concepts that exist in several cultures in Indonesia that can be used as learning resources for mathematics. The research method used is research and development (RnD). To get a proper application, testing is done using blackbox testing. This application is expected to make ethnomatematics a basis for learning mathematics in the modern era.