<![CDATA[Low motivation, critical thinking skills, and learning outcomes of students in Mathematics require teachers to use interesting learning models such as Problem Based Learning, Group Investigation, and Game Based Learning. Therefore, the purpose of this study is to describe teacher activities and analyse the improvement in student activities, motivation, critical thinking skills, and learning outcomes after using these three learning models. This research uses the type of Classroom Action Research which is carried out in 4 meetings. The subject of this study is 26 third-grade students of SDN Sungai Miai 4 Banjarmasin, consisting of 11 female students and 15 male students, in the even semester of 2024/2025. Data collection techniques used through observation sheets of teacher activities, student activities, motivational questionnaires, critical thinking skills, and learning outcomes obtained by tests and non-tests in groups and individuals. The data analysis in this study uses descriptive analysis techniques described with tables and graphs. The results of the study showed that teachers' activities increased from a score of 27 to 32 with the criterion of "Excellent". Student activity increased from 65% to 92% with the criterion of "Almost All Students Are Very Active". Motivation increased from 92% to 100% with the criterion of "Very High Motivation of All Students". Critical thinking skills increased from 58% to 88% with the criterion of "Almost All Students Are Highly Skilled". The increase in several aspects has an impact on cognitive student learning outcomes which increased from 65% to 92%, affective learning outcomes from 62% to 88%, and psychomotor learning outcomes from 58% to 92%. Based on these findings, it is concluded that the use of Problem Based Learning, Group Investigation, and Game Based Learning models can improve student activities, motivation, critical thinking skills, and learning outcomes.]]>
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