TARIGAN, Ita Margaretta Br. Development of a Student-Centered Digital Mathematics Learning Prototype Using the ADDIE Model to Improve Conceptual Understanding. JCEIT: Journal of Computer Engineering and Information Technology, [S. l.], v. 2, n. 2, p. 129–137, 2026. DOI: 10.64810/jceit.v2i2.58. Disponível em: https://jurnal.ktsi.my.id/index.php/jceit/article/view/58. Acesso em: 18 apr. 2026.