This study aims to determine the improvement in student learning outcomes through the implementation of the Number Heads Together learning model. This research is a Classroom Action Research (CAR) study. It was conducted at SDN 1 Beureunuen during the even semester of the 2019/2020 academic year. The subjects were 34 of the 4th grade students with heterogeneous abilities. Data collection techniques included observation sheets and evaluations. The study was carried out over three cycles, reaching completion in the third cycle. Observation results showed average student learning outcome scores of 65.73 in Cycle I, 84.2 in Cycle II, and 93.97 in Cycle III. The classical mastery rate reached 35.29% in Cycle I, 75.52% in Cycle II, and 100% in Cycle III. Thus, it can be concluded that the implementation of the Number Heads Together model can improve student learning outcomes.
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