<![CDATA[This study aims to improve the mathematical problem-solving ability of third grade elementary school students through the application of the Problem Based Learning (PBL) learning model on the material of measuring length and weight. The type of research used is Classroom Action Research (CAR) which is carried out in two cycles, each consisting of planning, implementation, observation, and reflection stages. The subjects of the study were 17 third-grade elementary school students of SDN 021 Bangkinang. Data were collected through observations of teacher and student activities and problem-solving ability tests at each meeting. The results of the study showed an increase in students' problem-solving ability in each cycle. In Cycle I, Meeting I, only 41.18% of students completed the task with a very poor category. The completion rate increased to 58.82% at the second meeting with a sufficient category. In Cycle II, there was a better increase, namely 76.47% of students completed the task at the first meeting and increased to 88.24% at the second meeting with a good category. This shows that the application of the Problem Based Learning learning model can improve the mathematical problem-solving ability of third-grade elementary school students on the material of measuring length and weight.]]>
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