แซ่พู่ เ, ใจอ่อน จ. Effects of Polya’s Problem-Solving Approach Combined with the Bar Model Technique on Grade 4 Students’ Problem-Solving Ability in Addition and Subtraction of Whole Numbers Greater than 100,000 at Piboonsawasdee Municipal School, Phuket Province. BMV [Internet]. 2026 May 31 [cited 2026 Jul. 29];3(1):694-708. Available from: https://benjamit.thonburi-u.ac.th/ojs/index.php/bmv16/article/view/689