This study aims to: (1) determine the planning of the Teams Games Tournaments (TGT) learning model, (2) determine the implementation of improving student learning outcomes through the application of the TGT learning model, and (3) determine the improvement of student learning outcomes through the application of the TGT learning model. The research design used is a Kurt Lewin model of classroom action research (PTK) carried out in two cycles, where each cycle includes planning, implementation, observation, and reflection stages. The research subjects were 31 students of class III SDN Pegajahan 1. Data were collected through post-test to measure the achievement of learning outcomes in science subjects. Data analysis was carried out descriptively by calculating the average value and percentage of learning completeness. The results showed an increase in learning outcomes from cycle I (total 1,835, average 59.19, completeness 61.29%) to cycle II (total 2,800, average 90.32, completeness 90.32%). The increase in learning completeness by 51.61% shows that the application of the TGT learning model can significantly improve the science learning outcomes of third grade students of SDN Pegajahan 1.
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