The Problem Based Learning model is a learning model that prioritizes problems in its presentation. Through the Problem Based Learning model it can also stimulate students' thinking abilities and students' active role in the learning process. So, through the application of the Problem Based Learning model, researchers conducted Classroom Action Research (PTK) with the aim of improving mathematics learning outcomes. The subjects of this research were students in class IX-D of SMP Negeri 1 Diwek. The research instruments used were pre-cycle test sheets, cycle I post-test sheets, cycle II post-test sheets, and documentation. The research results show that the Problem Based Learning model can improve the learning outcomes of class IX-D students at SMP Negeri 1 Diwek in accordance with the KKTP, namely 53.12% of students complete (pre-cycle), 68.75% of students complete (cycle I), and 87.5% of students completed (cycle II).
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