KHRUEANGWICHA, R.; NONTAPA, R. . Mathematical Concept Study the Ability to Use Symbols and Algebraic Operations that Affect Mathematical Problems in Fractions of 1st-Grade Students. Interdisciplinary Academic and Research Journal , Maha Sara Kham, TH., v. 3, n. 6, p. 221–238, 2023. DOI: 10.60027/iarj.2023.271254. Disponível em: https://so03.tci-thaijo.org/index.php/IARJ/article/view/271254. Acesso em: 10 dec. 2025.