Sartono, Sartono, and Karso Karso. “Are the Fractions Difficult? A Case Study at Elementary School 033 Asmi”. International Conference on Elementary Education 2, no. 1 (March 4, 2020): 1029-1043. Accessed April 29, 2024. http://proceedings.upi.edu/index.php/icee/article/view/714.