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), [S. l.], v. 4, n. 1, 2020. Disponível em: https://journal-repository.com/index.php/ijcmp/article/view/3378.. Acesso em: 9 apr. 2025.