Ethnomathematics In Arfak West Papua-Indonesia Numeracy Of Arfak

This article discusses ethnomathematics in Arfak indigenous communities. The focus of this research is how to calculate Arfak society in the form of the language of the hatam. The purpose of this study is to know the type of numbers in the language hatam by people in everyday life in the calculation and then look for the addition of algorithms according to the type of number. The method used in this research is ethnography. Next searched the addition of algorithms that match the type of numbers used by the community. The results obtained in this study are the numbers in the language hatam using base number 5-10. Of the numbers obtained the appropriate summation algorithm is Abacus 4.1.