<![CDATA[This study was motivated by the low ability of students in solving mathematical problems systematically and logically. One of the causes is the use of conventional learning models that do not actively involve students in the critical thinking process. This study aims to determine the effect of Problem Based Learning (PBL) learning model on students' mathematical problem solving ability. The method used is a quantitative approach with a quasi-experimental design. The population in this study were all fourth grade students at SDN Cikahuripan, while the sample consisted of two classes selected purposively, namely the experimental class using the PBL model and the control class using the conventional learning model. The research instrument was a validated mathematical problem solving ability test. Data analysis was conducted using t-test. The results showed a significant difference between the mathematical problem solving skills of students who participated in learning with the PBL model compared to students who studied conventionally. Students in the experimental class showed higher improvement in understanding the problem, designing a solution strategy, and concluding the results logically. This research also opens opportunities for further studies on the application of PBL at various levels and other subjects.]]>
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