<![CDATA[This study aims to determine the effectiveness of the implementation of ethnomathematics-based learning in the context of the Batik Mandalikan Banten motif in improving students' ability to understand mathematical concepts and productive disposition, as well as identifying mathematical elements in Banten culture. The method used is quantitative with a quasi-experimental design in the form of a pretest-posttest control group design. The research subjects consisted of two X classes at SMKS PGRI 3 Serang City, namely X DKV 1 as an experimental class and X DKV 2 as a control class. The instruments used were tests of ability to understand mathematical concepts and productive disposition questionnaires. Data analysis includes N-Gain calculation, normality, homogeneity, two-sample similarity test, and questionnaire percentage analysis. The results of the study showed that ethnomathematics-based learning of the Batik Mandalikan Banten motif was effective in improving students' understanding of mathematical concepts and productive disposition compared to conventional learning. In addition, mathematical elements in the form of rows and arithmetic sequences were found in the motif of Batik Mandalikan Banten, which was used as the context of learning materials. The integration of local culture in mathematics learning has proven to be a meaningful and innovative strategy, as well as encouraging student character in facing the challenges of learning mathematics Keywords: Ethnomathematics-based learning, Batik Motif Controls Banten, Mathematical Comprehension Ability, Productive Disposition.]]>
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