QOLBU, Syadza Zahrotul; SATI; AFENDI, Arief Hidayat. The Use of Geoboard Manipulative to Improve Elementary School Student Mathematical Problem-Solving Skills: A Classroom Action Research. Mathline : Jurnal Matematika dan Pendidikan Matematika, [S. l.], v. 11, n. 3, p. 667–680, 2026. DOI: 10.31943/mathline.v11i3.1183. Disponível em: https://mathline.unwir.ac.id/index.php/Mathline/article/view/1183. Acesso em: 16 aug. 2026.