Thota Murni Gultom, Hardi Tambunan. Analysis Of Students ’ Understanding Of Mathematical Concepts In Class Viii Function Material Smp Negeri Satu Atap Tanjung Balai T.P 2021/2022. IJHESS [Internet]. 2022 Dec. 3 [cited 2026 Jun. 25];2(3). Available from: https://ijhess.com/index.php/ijhess/article/view/287