MOHAMED SAEED SAEED, Z. Difficulty in learning mathematics for primary school students. College of Basic Education Research Journal, [S. l.], v. 16, n. 3, p. 77–96, 2020. DOI: 10.33899/berj.2020.165984. Disponível em: https://stats.uomosul.edu.iq/index.php/berj/article/view/39406. Acesso em: 26 oct. 2025.