The Effect of Instructional Time Frequency on Middle School Students’ Mathematics Achievement Scores. International Journal of Research in Education and Science, [S. l.], p. 705–712, 2020. DOI: 10.46328/ijres.v6i4.1265. Disponível em: https://ijres.net/index.php/ijres/article/view/1051. Acesso em: 8 jun. 2025.