Vlachou, Roza, and Evgenios Avgerinos. “?ult?ple representat?Ons and Development of students’ Self-Confidence on Rational Number”. EDiMaST: Experiences of Teaching with Mathematics, Sciences and Technology 4 (December 10, 2018): 567–586. Accessed January 26, 2022. https://www.edimast.it/index.php/edimast/article/view/59.