Student interest in the Islamic Religious Education subject at SDN 375 Lalong Selatan remains suboptimal, characterized by a lack of enjoyment, attention, curiosity, and engagement in the learning process. This study aims to enhance students' learning interest through the implementation of the Numbered Heads Together cooperative learning model. The study employs the Classroom Action Research (CAR) method based on Kurt Lewin's model, comprising four stages: planning, action, observation, and reflection. The subjects of the study were 28 fifth-grade students at SDN 375 Lalong Selatan. Data were collected through observation, questionnaires, and documentation. The results indicate an increase in teacher activity, student activity, and student learning interest across each cycle. Questionnaire results show that student learning interest at the pre-cycle stage was 36.04%, falling into the "low" category. In Cycle I, teacher activity reached 91.66% and student activity reached 90%—both in the "very good" category—while student learning interest reached 82.13%, falling into the "good" category. In Cycle II, both teacher and student activities reached 100% ("very good" category), while student learning interest rose to 90.67% ("very good" category). These findings demonstrate that the implementation of the Numbered Heads Together model, accompanied by increased learning activity, aligns with the rise in student learning interest observed in this study
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