Soriano, Manelyn. “Manipulative-Based Mathematics Instruction and Number Sense Development Among Grade 3 Pupils”. International Journal of Education, Research, and Innovation Perspectives 2, no. 4 (April 24, 2026): 1380–1390. Accessed April 30, 2026. https://ijerip.erio.org.ph/index.php/articles/article/view/512.