Zhondo Macas, Anabell Alexandra, and Manuel Polivio Cartuche Andrade. “The Numerator: Manipulative Material for Learning Basic Operations in the Fourth Grade of General Basic Education”. InveCom Journal 3, no. 2 (April 27, 2023): 1–17. Accessed November 11, 2026. https://www.revistainvecom.org/index.php/invecom/article/view/591.