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The aim of this research is to investigate ethnomathematics in calendar system of baduy using ethnography method. Study of ethnomathematics in our research used the intersection between cultural anthropology, mathematical concepts and mathematical modelling. We found a certain pattern in baduy calendar, in which,  It is the reason why baduy people who have no mathematical knowledge from the formal school  can predict , for an example,  the first day in the next months exactly.

Baduy Calendar , Ethnomathematics.