Promtrud, A., & Vibulrangson, S. . (2023). Developing Learning Activities Using an Open Approach Together with Assessment for Learning to Promote Mathematical Competencies of Ninth Grade Students . Journal of Education Studies, 51(4), EDUCU5104010 (17 pages). Retrieved from https://so02.tci-thaijo.org/index.php/EDUCU/article/view/263415