Abregana, Estella S., Bazil T. Sabacajan, Alexander N. Morados, and Wenie L. Nahial. “Challenges Encountered in Teaching Four Basic Operations in Mathematics and Academic Performance Among Pupils”. International Journal of Multidisciplinary: Applied Business and Education Research 6, no. 2 (February 23, 2025): 554-563. Accessed March 10, 2025. https://ijmaberjournal.org/index.php/ijmaber/article/view/2244.