The Impact of the Flipped Classroom Model on Middle School Students’ Academic Achievement and 21st Century Skills . International Journal of Research in Education and Science, [S. l.], v. 11, n. 4, p. 779–793, 2025. DOI: 10.46328/ijres.5073. Disponível em: https://ijres.net/index.php/ijres/article/view/5073. Acesso em: 4 oct. 2025.