This study aims to improve the activeness and learning outcomes of students in mathematics learning through the application of cooperative learning model type Team Games Tournament (TGT) in Class V SD Negeri 067259 Medan Johor. The method used is Class Action Research (PTK) which consists of two cycles, each of which includes the stages of planning, action, observation, and reflection. The subjects of the study were 25 fifth grade students in the even semester of the 2024/2025 academic year. Data collection techniques are done through observation, learning outcomes tests, and documentation. The results showed an increase in student activity and learning outcomes after the application of the TGT model. Students ' activeness increased gradually from low category in pre-cycle to active in Cycle II. Student learning outcomes also increased with learning completeness reaching 36% in pre-cycle, 60% in cycle I, and increased significantly to 88% in Cycle II. Thus, the TGT learning model proved to be effective in improving the activeness and learning outcomes of students in Mathematics.
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