Ethnomathematics in Javanese Death Commemoration Etnomatematika Pada Peringatan Kematian Masyarakat Jawa

Abstract

In Java, there is a tradition called death commemoration. In Javanese society, death commemoration consists of geblag (commemoration afther funeral), commemoration at 3^rd day of the death, 40^th day of the death, 100^th day of the death, 1 year, 2 years, and 1000^th day of the death. This was a descriptive research. It used ethnography method. The data was collected by interview, observation, and literature study. The result said that to decide the day and pasaran of death commemoration, it is need to use modulo concept. We used modulo 7 to decide the day, because there are seven days in a week and to decide the pasaran we used modulo 5 because there are five pasarans. It means that death commemoration tradition in Javanese society applied mathematical concept. Then, death commemoration tradition in Javanese is a part of ethnomathematics.