อ้วนพรมมา ว. The Development of Mathematics Learning Activities Based on Constructivist Theory Emphasizing Polya’s Problem-Solving Processes On Probability for Mathayomsuksa 5. JILS [internet]. 2018 May 24 [cited 2026 Sep. 12];11(4):154-66. available from: https://so02.tci-thaijo.org/index.php/EDGKKUJ/article/view/125463