ASTUTI, R. D. The Influence of Problem-Based Learning Models on Middle School Students’ Understanding of Mathematical Concepts. Journal of Science Education (Jo-SE), [S. l.], v. 1, n. 1, p. 25–29, 2025. Disponível em: https://journals.joninstitute.org/index.php/Jose/article/view/60. Acesso em: 18 apr. 2026.