Hilal Kahraman, Elif Kul, Tuba Aydoğdu İskenderoğlu. 2019. “Strategies Employed by 7th and 8th Graders for Quantitative Proportional Reasoning Problems”. Turkish Journal of Computer and Mathematics Education (TURCOMAT) 10 (1):195-216. https://turcomat.org/index.php/turkbilmat/article/view/200.