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. 2026;3(1):694-708. Accessed June 13, 2026. https://benjamit.thonburi-u.ac.th/ojs/index.php/bmv16/article/view/689