This study aims to describe the application of the Project Based Learning (PjBL) model to improve learning outcomes in the circumference and area of flat shapes in grade 4 Elementary Schools. This type of research is Classroom Action Research (CAR) using qualitative and quantitative approaches. The research subjects were teachers and 32 students in grade 4 of elementary school 16 Padang Besi. The results showed an increase. In the first cycle the observation results of the implementation of learning plans from 82.1% to 92.9% in the second cycle. Implementation on the aspects of teachers and students in the first cycle was 71.9% to 93.8% in the second cycle. The average assessment of student learning outcomes in the first cycle 60.63 to 86.88 in the second cycle.
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