MEI KALIMATUSYARO; VIVI AFBRIANI; ZUNI HUMAIROH; FITROTIN HASANAH. Effectiveness of Problem-Based Learning in Improving Elementary Students’ Mathematics Achievement. Celebes Journal of Elementary Education, [S. l.], v. 4, n. 1, p. 125–135, 2026. DOI: 10.31605/cjee.v4i1.6621. Disponível em: https://ojs.unsulbar.ac.id/index.php/cjee/article/view/6621. Acesso em: 10 jun. 2026.