<![CDATA[The purpose of this research is to explain how the mathematical activities in the salt ponds in Kebonangung Village are not realized by the coastal communities and students of the mathematical concepts related to ethnomathematics in mathematical activities in the salt ponds. This type of research is an ethnographic qualitative research method. Data obtained through interviews, observation, and documentation. The instrument in this study consisted of the main instrument, namely the researcher himself and auxiliary instruments in the form of interview guidelines, observation sheets, and documentation tools. The data validity technique used is method triangulation and source triangulation. The results of this study are salt ponds which have mathematical concepts including: (1). Rotation and circles that are on the windmill, (2). The rectangular shape found in the salt field, (3). Arithmetic sequences contained in the yield of each per tribe.]]>
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