Selorio, Aljun, and Ma. Chona Futalan. “Early-Grade Foundational Numeracy Skills: A Pretest-Posttest Analysis Among Grades 1 to 3 Pupils”. Journal of Interdisciplinary Perspectives, vol. 4, no. 4, Mar. 2026, pp. 153-8, https://jippublication.com/index.php/jip/article/view/2489.