This study aims to describe the application of project-based learning models (PBL) in improving student learning outcomes in the material of volume of geometric shapes in class V UPT SPF SD Negeri 106815 Marindal I. The type of research used is Classroom Action Research (CAR) which is carried out in three cycles to improve the learning process and improve student learning outcomes. The subjects of this study were 22 class V students. Data collection techniques were carried out through observation of learning activities and learning outcome tests. The results of the study showed that: (1) student learning activities increased from cycle I by 85.22%, cycle II by 87.37%, and cycle III by 93.45%; (2) student learning outcomes also increased, with classical completeness of 50% in cycle I (average value of 73.63), increasing to 81.81% in cycle II (average value of 85), and reaching 95.43% in cycle III (average value of 93.63). Based on these results, it can be concluded that the application of the project-based learning model is effective in improving student learning outcomes in the material on the volume of spatial figures in class V UPT SPF SD Negeri 106815 Marindal I
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