HASIBUAN, M. A.; HARAHAP, N.; MUTIAH, E. Strategy improving students’ understanding of multiplication concepts through abacus props abacus 100 beads class 2 sd negeri 0119 banjar raja. International Journal of Curriculum Development, Teaching and Learning Innovation, [S. l.], v. 2, n. 3, p. 136–141, 2024. DOI: 10.35335/curriculum.v2i3.202. Disponível em: https://trigin.pelnus.ac.id/index.php/Curriculum/article/view/202. Acesso em: 18 apr. 2026.