“Improvement of Fifth Grade Students’ Mathematical Reasoning and Learning Activity With the Implementation of Problem Solving Learning Model”. JOURNAL OF TEACHING AND LEARNING IN ELEMENTARY EDUCATION (JTLEE) 3, no. 2 (August 10, 2020): 132–141. Accessed January 3, 2026. https://jtlee.ejournal.unri.ac.id/index.php/JTLEE/article/view/137.