خضر A.; YOUNIS, W. The mental arithmetic strategy on the achievement among fourth grade girl students. Journal of Education for the Humanities , [S. l.], v. 3, n. 122, p. 17–38, 2023. DOI: 10.33899/jeh.2023.181109. Disponível em: https://edusj.uomosul.edu.iq/index.php/jeh/article/view/42674. Acesso em: 10 sep. 2025.