ABREGANA, Estella S.; SABACAJAN, Bazil T.; MORADOS, Alexander N.; NAHIAL, Wenie L. Challenges Encountered in Teaching Four Basic Operations in Mathematics and Academic Performance among Pupils. International Journal of Multidisciplinary: Applied Business and Education Research, Malang, Indonesia, v. 6, n. 2, p. 554–563, 2025. DOI: 10.11594/ijmaber.06.02.11. Disponível em: https://ijmaberjournal.org/index.php/ijmaber/article/view/2244. Acesso em: 24 jan. 2026.