<![CDATA[This study aimed to develop a digital student worksheet (LKPD) based on Problem Based Learning (PBL) that is valid, practical, and effective for junior high school mathematics learning. Initial observations in Grade VIII at SMPS St. Antonius Padua Leworahang indicated that students tended to be passive and had difficulty understanding mathematical concepts. The digital PBL-based worksheet was designed to combine problem-based active learning with interactive digital media. This research and development study used the Plomp model, comprising preliminary investigation, design, realization/construction, test, evaluation and revision, and implementation. The participants were Grade VIII students at SMPS St. Antonius Padua Leworahang. Data were collected using material, media, and practitioner validation forms, a readability questionnaire, a student response questionnaire, and a mathematical conceptual understanding test. Validation scores were 96.77% for material experts, 94.12% for media experts, and 100% for practitioners; all were classified as very valid. The readability score was 96%, while student responses reached 97%, classified as very practical. In the large-scale trial, the learning completion rate reached 85%, classified as very effective. These findings indicate that the developed digital PBL-based worksheet is suitable for supporting mathematics learning.]]>
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