This study aims to examine the cultural links in a local area with mathematical concepts or commonly known as ethnomathematics. This ethnomathematical research raises the topic of discussion about a "Nasi Face-to-face" procession at weddings in the traditional Malay culture of Batubara, North Sumatra. This research will explore what mathematical aspects are contained in a regional culture of the Batubara Malay tribe, especially the "Nasi Face-to-face" procession. Descriptive qualitative

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... method with ethnographic approach is used in this study. The results showed that in the procession of "Nasi Facing-front" found various mathematical concepts related, namely sets, functions, geometry of flat shapes, and geometry of geometric shapes. With this research, it is hoped that it can be used as a unique medium for learning mathematics as well as getting to know the local culture that is applied in learning mathematics in schools.