This study aimed to determine whether the application of the discovery learning model could improve student learning outcomes. The research employed the Classroom Action Research (CAR) method, comprising the stages of planning, implementation, observation, and reflection. The subjects of the study were 29 of the 4th grade students, consisting of 13 boys and 16 girls. Data were collected using student worksheets and observation sheets. In Cycle I, the students achieved an average score of 63.10, with a mastery rate of 58.62%. In Cycle II, the average score rose to 73.65, with a mastery rate of 86.20%. In Cycle III, student learning outcomes showed optimal improvement, marked by an average score of 82.58 and a 100% mastery rate—meaning all students participating in the action learning achieved scores exceeding the established Classical Mastery Criteria. Thus, it can be concluded that the discovery learning model can improve the learning outcomes of 4th grade students at MIS Tuanku Hasyem Banta Muda.
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