Use of a mobile app as an alternative to learning fractional operations in high school students during the COVID-19 pandemic. Case: Industrial Technical High School No. 15. Educ. Tecnol. [Internet]. 2023 May 15 [cited 2026 Jul. 5];(15):55-67. Available from: http://revistas.umce.cl/index.php/edytec/article/view/1628