Hasibuan MA, Harahap N, Mutiah E. Strategy improving students’ understanding of multiplication concepts through abacus props abacus 100 beads class 2 sd negeri 0119 banjar raja. Curriculum [Internet]. 2024 Jul. 31 [cited 2026 Apr. 18];2(3):136-41. Available from: https://trigin.pelnus.ac.id/index.php/Curriculum/article/view/202