Eksplorasi Konsep Etnomatematika pada Proses Pembuatan Kue Lapis Batik Motif Ketupat Khas Sambas

Abstract

This study aims to identify mathematical concepts embedded in the process of producing Lapis Batik, a traditional cake from Sambas, and to examine its potential as an ethnomathematics-based learning resource for strengthening numeracy literacy. The study employed a descriptive qualitative approach through interviews with craftsmen and documentation of specialized tools and the finished cakes. The analysis was conducted by classifying mathematical activities according to Bishop’s six fundamental activities. The findings indicate that the production of Lapis Batik involves a wide range of mathematical concepts, including ratios, measurement, similarity and congruence, sequence patterns, logical implications, plane and solid geometry, and transformations. These concepts are reflected in ingredient measurements, the regularity of layered structures, and the patterns of batik-inspired motifs. The results suggest that Lapis Batik from Sambas has strong potential as a contextual learning medium that supports students’ conceptual understanding and problem-solving skills. This study contributes to the enrichment of ethnomathematics literature in West Kalimantan and provides a foundation for the development of instructional materials grounded in local culture.