Chookhampaeng , S. et al. 2025. Development of Mathematical Problem-Solving Ability Using Polya’s Problem-Solving Process Combined with Bar Models for Grade 4 Students. Journal of Cultural Analysis and Social Change. 10, 2 (Nov. 2025), 2793–2798. DOI:https://doi.org/10.64753/jcasc.v10i2.2001.