The Effect of Using Mathematical Representations in the Achievement of Fourth Grade Students in Mathematics. Journal Port Science Research, [S. l.], v. 2, n. 3, p. 593–613, 2019. DOI: 10.36371/port.2018.02.3.13. Disponível em: https://jpsr.uruk.edu.iq/index.php/jport/article/view/39. Acesso em: 13 may. 2026.