DULAY, Myra; DE GUZMAN, Ana Perla. Concrete Models in Improving Students Performance on Operations of Integers . International Journal of Education, Research, and Innovation Perspectives, Philippines, v. 2, n. 9, p. 1131–1137, 2026. DOI: 10.5281/zenodo.22803928. Disponível em: https://ijerip.erio.org.ph/index.php/articles/article/view/1723. Acesso em: 23 sep. 2026.