INDIANI, Devi; ROCHMAH, Eliya; WIDIAWATI, Hema. The Effect of Problem- Based Learning Supported by Math Playground on Third-Grade Students’ Learning Engagement. Mathline : Jurnal Matematika dan Pendidikan Matematika, [S. l.], v. 11, n. 3, p. 743–756, 2026. DOI: 10.31943/mathline.v11i3.1181. Disponível em: https://mathline.unwir.ac.id/index.php/Mathline/article/view/1181. Acesso em: 20 aug. 2026.