ETHNOMATHEMATICS AND BATIK CULTURAL CONVERSATION: A QUALITATIVE-ETHNOGRAPHIC STUDY OF MATHEMATICAL CONCEPTS IN BATIK CEPLOK KASATRIAN

Batik Ceplok Kasatrian is an Indonesian cultural heritage that is full of philosophical meaning but is less known by the younger generation. Therefore, the integration of batik in mathematics learning can be one of the strategies to preserve tradition of batik culture. This research aims to explore mathematical concepts, such as geometry, algebra, arithmetic, and statistics, in Batik Ceplok Kasatrian motifs. This research uses qualitative-ethnographic. The subject of this study is the Batik Ceplok Kasatrian motif. Data validity is obtained through source triangulation, while data analysis includes reduction, presentation, and conclusion. The exploration process is carried out by answering four main questions: "Where do I begin exploring?", "How can I discover it?", "How will I know if it has discovered something important?", and "How can I make sense of it?". The results show that of the four mathematical concepts, only two mathematical concepts are found in this batik, namely geometry and arithmetic. Geometry subconcepts include transformation (reflection, translation, dilation) and plane geometry (line segments, symmetry, congruence). Arithmetic subconcept includes integers (odd-even numbers). These findings can be integrated into mathematics learning through the development of ethnomathematics-based assessments oriented towards High Order Thinking Skills.