<![CDATA[The purpose of this research is to improve the critical thinking skills of fourth-grade students at SD Negeri Jajar No. 73 for the 2024/2025 academic year in mathematics through the application of the Problem Based Learning. The type of this study is classroom action research. The subjects are the students and a teacher of the fourth class at SD Negeri Jajar No. 73. The data collection methods in this research use interviews, observations, tests, and documentation. The research instruments used in this study were interview procedures, observation sheets, and evaluation tests. The data validity test techniques used were source triangulation and technical triangulation. Data analysis used an interactive analysis model. The research results show that students’ critical thinking skills increased from 64% in cycle I to 88% in cycle II. Based on the results of this study, it was concluded that the applications of the Problem Based Learning in fourth-grade mathematics at SD Negeri Jajar No. 73 increase students' critical thinking skills.]]>
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