The purpose of this study was to improve the learning outcomes of fifth-grade students at Nyama Christian Elementary School by implementing a problem-based learning model. This study used the Classroom Action Research (CAR) method, which focused on classroom situations. Classroom action research is research conducted by teachers in their own classrooms through self-reflection with the aim of improving their performance as teachers, thereby increasing student learning outcomes (Aqib, Zainal: 2010). The overall average score for student learning tests increased, as reflected in the initial test results, which averaged 41, increasing to 60 in Cycle I, and reaching 78 in Cycle II. Therefore, it can be concluded that the application of the problem-based learning (PBL) model can improve student learning outcomes.
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