<![CDATA[This study was motivated by students’ low understanding of three-dimensional geometry due to the abstract nature of the material and the limited use of learning media that provide concrete learning experiences. The purpose of this study was to develop and examine the effectiveness of a Smart Box learning media based on the ethnomathematics of Tegowangi Temple for fifth-grade elementary school students. This research employed the Research and Development (R&D) method using the ADDIE model, which consists of the stages of analysis, design, development, implementation, and evaluation. The research subjects consisted of 12 students in the limited trial and 27 students in the field trial at SDN Sukorame 2, Kediri City. The research instruments included material and media validation sheets, teacher and student response questionnaires, and pretest-posttest questions. The results showed that the developed media achieved a very high level of validity, with material expert validation reaching 100% and media expert validation reaching 90.5%. The practicality of the media was also categorized as very practical, with teacher responses of 97.6%, limited trial responses of 95.8%, and field trial responses of 97.4%. The effectiveness of the media was demonstrated by an N-Gain score of 0.86 in the high category and a Wilcoxon test result of 0.000 < 0.05. Therefore, the Tegowangi Temple Ethnomathematics-Based Smart Box was proven to be valid, practical, and effective as a learning medium for teaching three-dimensional geometry in elementary schools.]]>
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