Caiza-Llambo MM. Importance of the development of skills in addition and subtraction of fractions as a methodological proposal of the teaching exercise. YUYAY [Internet]. 2023 Sep. 24 [cited 2026 Jan. 22];2(1):150-62. Available from: https://jlacolectivo.com/revistas/index.php/YUYAY/article/view/32