<![CDATA[The low mathematics learning outcomes of fifth-grade students at Sri Mulya Jaya 1 Public Elementary School are caused by the teacher-centered learning process, which results in students being less active and lacking in problem-solving skills. This study aims to improve student learning outcomes through the application of the Problem-Based Learning (PBL) model in Mathematics for whole numbers up to 100,000. This study is a Classroom Action Research (CAR) conducted in two cycles with planning, implementation, observation, and reflection. The subjects were 25 fifth-grade students at Sri Mulya Jaya 1 Public Elementary School. Data collection techniques were observation, interviews, documentation, and learning outcome tests. Data analysis used a mixed method, namely qualitative and quantitative analysis. The results of the study indicate that the implementation of the Problem-Based Learning (PBL) model can improve student learning outcomes, as indicated by an increase in the percentage of learning completion from 40% in cycle I to 80% in cycle II, resulting in a 40% increase. Therefore, the Problem-Based Learning (PBL) model can improve the Mathematics learning outcomes of fifth-grade students at SD Negeri 1 Sri Mulya Jaya.]]>
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