This study is a Classroom Action Research (CAR) which aims to improve the mathematics learning outcomes of class VII students of SMP Negeri 3 Sungguminasa through the application of Problem Based Learning (PBL) assisted by Student Worksheets (LKPD). The subjects in this study were 28 class VII students of SMP Negeri 3 Sungguminasa, consisting of 12 male students and 16 female students. The object of this study was the results of mathematics learning. The research instrument used Student Worksheets (LKPD). The data analysis technique used quantitative descriptive percentage techniques. The results of the study showed that the application of Problem Based Learning (PBL) assisted by Student Worksheets (LKPD) can improve students' mathematics learning outcomes. This can be proven by the increase from pre-action to cycle II, namely the results of pre-action reached an average of student learning outcomes of 26.35 with a learning completion percentage of 0%, the results of cycle I reached an average of student learning outcomes of 79.03 with a learning completion percentage of 100 and the results of cycle II reached an average of learning outcomes of 90.03 with a learning completion percentage of 100%.
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