Effectiveness of Online Mathematics Learning during Covid-19: Empirical Evidence from a Tertiary Institution in Ghana. Online Learning In Educational Research (OLER), [S. l.], v. 3, n. 1, p. 1–13, 2023. DOI: 10.58524/oler.v3i1.211. Disponível em: https://journal.foundae.com/index.php/oler/article/view/211. Acesso em: 16 jan. 2026.