TEWEERUM , P.; SRINGAN , K.; WANNUPATAM, B. The Development of Learning Achievement and the Ability to Solve Mathematical Problems regarding fractions by Using Polya’s Problem Solving Concept with Bar Model for Grade 3 Students: The Development of Learning Achievement and the Ability to Solve Mathematical Problems regarding fractions by Using Polya’s Problem Solving Concept with Bar Model for Grade 3 Students. RATANABUTH JOURNAL, Yasothon, Thailand, v. 7, n. 3, p. 143–155, 2025. Disponível em: https://so07.tci-thaijo.org/index.php/rtnb/article/view/8878. Acesso em: 15 sep. 2026.