Akmal, Muhammad, and Elly Arliani. “The Effectiveness of Problem-Based Learning (PBL) in Improving Mathematical Conceptual Understanding and Numeracy of Grade VIII Students”. Instructional Media for Mathematics (IM Math) 3, no. 1 (June 1, 2025): 25–39. Accessed May 7, 2026. https://journal.aws-edu.id/index.php/IM-MATH/article/view/42.