Pengaruh Model Project Based Learning Berbasis Media Manipulatif Terhadap Kemampuan Pemecahan Masalah Matematis Siswa
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Abstract
This study aims to determine the effect of the Project Based Learning (PjBL) model based on manipulative media on students’ mathematical problem-solving abilities in the Pythagorean Theorem topic. This research employed a quasi-experimental method with a posttest-only control group design. The subjects were eighth-grade students of MTs Swasta Laboratorium IKIP Al-Wasliyah Medan, consisting of two classes: an experimental class and a control class, each with 26 students. The experimental class received instruction using the PjBL model based on manipulative media, while the control class was taught through a conventional learning model. The research instrument was a mathematical problem-solving test. The results showed that the experimental class achieved an average posttest score of 81.85, while the control class scored 55,19. The Independent Sample t-Test analysis revealed that the calculated t-value (10.722) was higher than the critical t-value (2.009) with a significance level of 0.000 < 0.05, indicating that H₀ was rejected and H₁ accepted. Therefore, it can be concluded that the implementation of the Project Based Learning model based on manipulative media significantly influences students’ mathematical problem-solving abilities
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