MAWADDATURROHMAH. THE EFFECTIVENESS OF LEARNING MATHEMATICS AT ISLAMIC BOARDING SCHOOLS IN SIAK HULU DISTRICT DURING THE COVID-19 PANDEMIC. Mathematics Research and Education Journal, [S. l.], v. 5, n. 2, p. 6–10, 2021. DOI: 10.25299/mrej.2021.vol5(2).7649. Disponível em: https://journal.uir.ac.id/index.php/JPM/article/view/7649. Acesso em: 21 jul. 2026.