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Thota Murni Gultom and Hardi Tambunan 2022. Analysis Of Students ’ Understanding Of Mathematical Concepts In Class Viii Function Material Smp Negeri Satu Atap Tanjung Balai T.P 2021/2022. International Journal Of Humanities Education and Social Sciences (IJHESS) . 2, 3 (Dec. 2022). DOI:https://doi.org/10.55227/ijhess.v2i3.287.