This study aims to examine the effectiveness of the Project-Based Learning (PjBL) model integrated with Deep Learning and STEAM approaches based on ethnomathematics in improving fifth-grade students’ reflective thinking skills on fraction material at SDN Kebraon 1 Surabaya. This research used a descriptive quantitative approach with pretest–posttest and student response questionnaires. The results showed a significant improvement in reflective thinking skills, indicated by moderate to high N-Gain scores. Students also gave positive responses, showing increased activeness, motivation, and better understanding of fraction concepts. Thus, this integrated approach is effective in creating meaningful and contextual learning.
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