เดชแพง น. The Development of Mathematical Learning Activities Based on Constructivist Theory Emphasizing Polya’s Problem Solving Processes on Mixed Word Problems for Prathomsuksa 4. EDGKKUJ [Internet]. 2018 May 20 [cited 2024 May 3];11(4):24-35. Available from: https://so02.tci-thaijo.org/index.php/EDGKKUJ/article/view/124474