MOCH NURHADI. Implementation of The Problem Based Learning Model in The Mathematics Learning Material Operations Counting Whole Numbers in Sixth Grade Elementary School . Papanda Journal of Mathematics and Science Research, [S. l.], v. 2, n. 2, p. 80–84, 2023. DOI: 10.56916/pjmsr.v2i2.508. Disponível em: https://ejournal.papanda.org/index.php/pjmsr/article/view/508. Acesso em: 12 jan. 2026.