Ritwanto, R., Sukiyanto, S., Pardimin, P., Djufri, E. and Pratomo, W. 2026. Development of Interactive Multimedia Integrating Problem-Based Learning and Banjar Ethnomathematics to Improve Mathematics Learning Outcomes among Second-Grade Elementary Students. ISEJ : Indonesian Science Education Journal. 7, 1 (Jan. 2026), 61-76. DOI:https://doi.org/10.62159/isej.v7i1.2312.