<![CDATA[This study was motivated by the low critical thinking skills and learning outcomes in Natural and Social Sciences (IPAS) among fifth-grade students at SDN 06 Metro Barat. The study aimed to improve students’ critical thinking skills and IPAS learning outcomes through the implementation of the Teams Games Tournament (TGT) model based on Teaching at the Right Level (TaRL). This study employed Classroom Action Research (CAR), conducted in three cycles, with each cycle consisting of two meetings involving planning, action, observation, and reflection. The participants were 23 fifth-grade students. Data were collected through diagnostic assessment, observation, tests, and documentation and were analyzed using quantitative and qualitative descriptive methods. The results showed that the mean critical thinking score increased from 63.04 in the pre-cycle to 80.87 in the second meeting of Cycle III. The percentage of students meeting the critical thinking criterion increased from 21.74% (5 students) to 82.61% (19 students). IPAS learning outcomes also improved, with the mean score increasing from 56.09 in the pre-cycle to 83.13 at the end of Cycle III. Based on the minimum mastery criterion of 75, learning mastery increased from 30.43% (7 students) to 82.61% (19 students). By the end of Cycle III, both variables had achieved the predetermined classical success criterion of at least 80%. These findings indicate that the implementation of the TaRL-based TGT model can improve fifth-grade students’ critical thinking skills and IPAS learning outcomes.]]>
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