POLUAKAN, C. .; RATULANGI, N. .; WANTU, M. . Implementation of the Problem-Based Learning Model in Teaching of Mathematics about Adding Fractions with Different Denominators in Elementary Schools. International Journal of Information Technology and Education, [S. l.], v. 3, n. 2, p. 15–23, 2024. DOI: 10.62711/ijite.v3i2.174. Disponível em: http://ijite.jredu.id/index.php/ijite/article/view/174. Acesso em: 31 jul. 2025.