PENGEMBANGAN FLASHCARD DIGITAL BERBASIS ETNOMATEMATIKA RELIEF CANDI BOROBUDUR UNTUK MENINGKATKAN KEMAMPUAN KOGNITIF DAN KREATIVITAS SISWA PADA MATERI GEOMETRI BANGUN DATAR KELAS II SEKOLAH DASARNIM.: 24204081022Khoirunnisa’ Cahya NingrumauthorLow levels of student cognitive ability and creativity are generally attributed to a one-way instructional approach, where students appear passive and lack enthusiasm during lessons, struggling to recognize and distinguish shapes, classify geometric figures, and understand the properties of 2D shapes. This study aims to examine the feasibility, practicality, and effectiveness of digital flashcards based on the ethnomathematics of Borobudur Temple reliefs in enhancing students' cognitive abilities and creativity. This study employs the Research and Development method using the ADDIE model. The research subjects consisted of 24 students and one teacher. Data were collected through questionnaires, documentation, and pre- and post-tests, then analyzed using both qualitative and quantitative descriptive methods. The research stages comprised (a) Analysis: analyzing product quality and development requirements; (b) Design: designing the product structure and components; (c) Development: realizing and validating the product; (d) Implementation: implementing the product; and (e) Evaluation: evaluating and refining the product. The research results indicate the following: First, regarding the feasibility of the digital flashcard learning media based on Borobudur Temple relief ethnomathematics, validity assessments by subject matter and media experts yielded scores of 95.45% and 96.42%, respectively, placing the media in the "highly feasible" category. Second, the practicality of the media was rated at 97.72%, falling into the "highly practical" category. Third, regarding effectiveness, a paired-sample t-test revealed significant differences in students' cognitive abilities and creativity, with a Sig. (2-tailed) value of 0.01 (< 0.05). Meanwhile, N-Gain test results showed improvements of 0.52 in cognitive ability and 0.51 in creativity, both falling within the "moderate" (effective) category.371.33 Media Pembelajaran2026-08-13UIN SUNAN KALIJAGA YOGYAKARTA;FAKULTAS ILMU TARBIYAH DAN KEGURUANThesis