Background: Students’ low learning outcomes in Islamic Religious Education are often associated with limited variation in instructional models and the continued dominance of conventional, teacher-centred approaches. Such conditions tend to reduce student engagement, limit interaction, and hinder the development of critical understanding. Objective: This study aims to improve students’ learning outcomes by implementing a cooperative learning model among fourth-grade students at SD Negeri 75 Palembang. Method: The research employed Classroom Action Research (CAR) conducted in three cycles, each consisting of planning, implementation, observation, and reflection. Data were collected through classroom observations and learning outcome tests, and analysis used a descriptive, quantitative approach to measure improvement across cycles. Results: The findings reveal a significant improvement in students’ learning outcomes, demonstrated by the consistent increase in average scores and the percentage of mastery learning from the pre-cycle to cycle III. Student participation and engagement also showed noticeable enhancement during the learning process. Conclusion: The cooperative learning model is effective in improving both academic achievement and student activeness. Originality/Value: This study contributes novel empirical and practical evidence to the field of primary education and Islamic Religious Education (IRE) pedagogy by revealing the progressive enhancement of academic mastery alongside increased student participation through a cyclical action research process regarding cooperative learning model efficacy within the context of fourth-grade elementary school learners (SD Negeri 75 Palembang), an area that has received limited empirical attention amidst widespread conventional, teacher-centred practices. These findings enrich empirical evidence and serve as a strategic reference for implementing interactive, student-centred classroom strategies and designing pedagogical development programs for primary school religious education teachers.
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