This study aims to develop a valid, practical, and effective Student Worksheet (LKPD) based on Project Based Learning (PjBL) with a Deep Learning approach to improve elementary school students' science learning outcomes. The novelty of this study lies in the integration of Project Based Learning syntax with a Deep Learning approach in developing LKPD to create more meaningful and student-centered learning. This study uses a Research and Development (R&D) method with a 4-D model that includes the Define, Design, Develop, and Disseminate stages. The study involved validator experts, learning practitioners, and fifth-grade students of SDN 101764 Bandar Klippa. Data were collected through interviews, questionnaires, and learning outcome tests, then analyzed descriptively quantitatively, N-Gain tests, and paired sample t-tests. The results of the study indicate that the developed LKPD meets the criteria of being valid, very practical, and effective and is able to improve students' science learning outcomes. Thus, LKPD based on PjBL with a Deep Learning approach is suitable for use as an open material to improve science learning outcomes in elementary schools.
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