Urbano-Urbano, Ivana Fernanda, Neyer Farley Gaviria-Garcés, and Raúl Prada-Núñez. “Difficulties in Learning the Concept of Area and Problem Solvin”. Mundo FESC Journal 11, no. S6 (February 10, 2021): 138–155. Accessed November 13, 2026. https://fesc.edu.co/Revistas/OJS/index.php/mundofesc/article/view/1114.