<![CDATA[Mathematics learning requires instructional approaches that enable students to understand abstract concepts through meaningful experiences. Ethnomathematics offers opportunities to connect mathematical ideas with cultural contexts; however, previous studies have largely focused on identifying mathematical concepts in cultural objects, while empirical evidence on the effectiveness of culture-based instructional materials remains limited. This study aimed to examine the effectiveness of Banten culture-based ethnomathematics video instructional materials in learning the Pythagorean Theorem. This study employed a posttest-only quasi-experimental design involving 60 eighth-grade students from a junior high school in Banten, Indonesia. The participants were divided into an experimental group ( ) and a control group ( ), with initial equivalence examined using Mid-Semester Test scores. Data were collected through a validated essay test and analysed using descriptive statistics, assumption tests, and an independent samples t-test. The experimental group achieved a higher mean posttest score (66.98) than the control group (46.11). The difference was statistically significant, , , with a large effect size (Cohen’s d = 0.95). The findings indicate that the developed instructional materials significantly improved students’ learning outcomes compared with conventional textbook-based instruction. However, the study was limited to one school and a relatively small sample. Future studies should involve broader contexts and additional learning variables.]]>
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