This study aims to analyze the completeness and improvement of students' mathematical understanding abilities, the application of the Problem Based Learning learning model assisted by Google Sites, and students' responses to the model. The method used is a mixed method with the Explanatory Sequential Design. The study population was all students of SMPN 3 Cikalongwetan, with samples of class VIII C as the experimental class and VIII B as the control class. Data were obtained from pretest and posttest, learning implementation, and student response questionnaires. The results showed an average posttest of 7.10 for the experimental class (89.65% completeness) and 68.07 for the control class (65.51% completeness), indicating that the experimental class was better. Learning implementation reached 80.42% (good criteria) and student responses were 84% (positive criteria).
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