MUNLIN, S. The Results of using the mathematics skill Practice on Adding and Subtracting Numbers 2 Numbers with Positive and Negative Results not Exceeding 9 for Prathomsuksa 1. Journal of Modern Learning Development, [S. l.], v. 9, n. 7, p. 153–165, 2024. Disponível em: https://so06.tci-thaijo.org/index.php/jomld/article/view/269745. Acesso em: 1 oct. 2026.