Sinaga, Juli Antasari. “The Effectiveness of Problem Based Learning Model to Improve the Understanding Concept of Students Prospective in Fractional Count”. International Journal Of Chemistry, Mathematics And Physics(IJCMP) 4, no. 1 (January 7, 2020). Accessed July 22, 2024. https://journal-repository.com/index.php/ijcmp/article/view/3378.