Pengaruh Penerapan Model PjBL dengan Pendekatan STEM Terhadap Peningkatan Kemampuan Berpikir Kreatif Matematis Siswa pada Materi Bangun Ruang Sisi Lengkung di SMP

This study aims to examine the effectiveness of implementing the Project-Based Learning (PjBL) model with a STEM approach in enhancing students' mathematical creative thinking skills on the topic of curved-surface solids. The method used is a pre-experimental design with a one-group pretest-posttest design, involving 33 students from Class IX.7 at SMP Negeri 1 Pinrang. Data were collected through creative thinking ability tests, student response questionnaires, and observation sheets of the learning implementation. The results showed a significant improvement in students’ mathematical creative thinking abilities after the application of the PjBL-STEM model, with the average score increasing from 40.58 to 83.23 and an average N-Gain score of 0.71. A total of 60.61% of students reached the "very creative" category, while 39.39% were in the "creative" category. The paired sample t-test revealed a significant difference between pretest and posttest scores (p < 0.05). Thus, the integration of the PjBL model with the STEM approach proved to be effective in improving students’ mathematical creativity through contextual, collaborative, and meaningful project-based learning.