An Ethnomathematics Study of the days on the Javanese Calendar for Learning Mathematics in Elementary School

Ethnomathematics is mathematical value that presents in a culture. Calendar as a system of time periods is ethnomathematics. The calendar has days, dates, and months. Likewise, the Javanese calendar has days, dates, months, years, and also pasaran. The use of certain days in Javanese society has several essential activities. The activities are spiritual, traditional market, social gathering, and village meeting activities. This study aims to reveal the ethnomathematics values on certain days of Javanese Calendar. It uses qualitative methods that follow the ethnomathematics study framework. Data collection techniques use interviews with traditional elders, and document analysis of Javanese Primbon (the special of Javanese Book). We propose ethnomathematics value of remainder and modulo associated with days in the Javanese Calendar. This ethnomathematics values can be used in elementary school mathematics clas