eabd alfataah eabd aljawaad muhamad, muhamad tahir eabd almawlaa. The Effect of Using Multiple Representations on the Development of Comprehension of Concepts and The Skill of Performing Arithmetic Operations and Solving Problems for Students of the Class Teacher Department in the Course of Principles of Mathematics. mjes [Internet]. 2017 Dec. 31 [cited 2025 Nov. 12];1(2):20-46. Available from: https://omu.edu.ly/journals/index.php/mjes/article/view/1143