Díaz-Cardenas, A. F., Díaz-Furlong, A., Díaz-Furlong, H. A., Sankey-García , M. R., & Zago-Portillo, G. (2019). Multiplication and division of fractions: numerical cognition development and assessment procedures. Revista Latinoamericana de Investigación en Matemática Educativa, 22(3). https://doi.org/10.12802/relime.19.2234