MENINGATKAN KEMAMPUAN PEMECAHAN MASALAH MATEMATIS MELALUI MODEL PROBLEM BASED LEARNING: IMPROVING MATHEMATICAL PROBLEM SOLVING ABILITY THROUGH THE PROBLEM BASED LEARNING MODEL. Abacus: Acad. J. Math. Learn. Educ. [Internet]. 2020 Dec. 15 [cited 2024 May 4];1(1):25-37. Available from: https://jurnal.upg.ac.id/index.php/abacus/article/view/383