Sitorus JJB, Suweken G, Ardana IM. Pengaruh Model Pembelajaran Problem Based Learning Dengan Pendekatan Difrensiasi Terhadap Kemampuan Pemecahan Masalah Matematika Siswa SMP Kelas VII Pada Materi Perbandingan: The Influence of the Problem-Based Learning Model with a Differentiated Approach on the Mathematical Problem-Solving Ability of Seventh-Grade Junior High School Students in Proportions. CITIZ. J. Ilm. Multidiscip. Ind [Internet]. 2026 Jul. 1 [cited 2026 Jul. 16];6(2):602-11. Available from: https://www.journal.das-institute.com/index.php/citizen-journal/article/view/1442