Shatara, Sally, and Refa’ Ramahi. 2021. “Primary School Teachers’ Knowledge of the Pedagogical Content of ‘Ratio and Proportion’ in Sixth and Seventh Grades: A Case Study”. Dirasat: Educational Sciences 48 (3):329-42. https://dsr.ju.edu.jo/djournals/index.php/Edu/article/view/2878.