HASIBUAN, Havidah Adawiyah; IRVAN, Irvan. Ethnomathematics Exploration of Making Traditional Ombus-ombus Cake Typical of North Tapanuli as a Source of Mathematics Learning. Mathline : Jurnal Matematika dan Pendidikan Matematika, [S. l.], v. 10, n. 1, p. 85–95, 2025. DOI: 10.31943/mathline.v10i1.717. Disponível em: http://mathline.unwir.ac.id/index.php/Mathline/article/view/717. Acesso em: 27 feb. 2026.