mawaddaturrohmah. THE EFFECTIVENESS OF LEARNING MATHEMATICS AT ISLAMIC BOARDING SCHOOLS IN SIAK HULU DISTRICT DURING THE COVID-19 PANDEMIC. MREJ [Internet]. 2021 Oct. 30 [cited 2026 Jul. 21];5(2):6-10. Available from: https://journal.uir.ac.id/index.php/JPM/article/view/7649