Rivaral ER, Lestariningsih D. EFFECTIVENESS OF PROBLEM BASED LEARNING ASSISTED BY POWERPOINT MEDIA ON STUDENTS’ MATHEMATICAL PROBLEM-SOLVING ABILITY IN JUNIOR HIGH SCHOOL. Perpendicular [Internet]. 2025 Dec. 30 [cited 2026 Jan. 19];1(2):71-9. Available from: https://jurnal.dokicti.org/index.php/perpendicular/article/view/1521