SIAHAAN, Yuni Hariati; SIREGAR, Syarifah Nur; MURNI, Atma. Implementation of Problem-Based Learning Model to Improve Mathematical Problem-Solving Skills of Grade XI-2 Students of SMAN 19 Pekanbaru. Jurnal Didactical Mathematics , [S. l.], v. 8, n. 1, p. 204–222, 2026. DOI: 10.31949/dm.v8i1.17437. Disponível em: https://www.ejournal.unma.ac.id/index.php/dm/article/view/17437. Acesso em: 18 jun. 2026.