Urni Babys, Netty J. Marlin Gella and Mario Dos Santos Amaral 2023. Analysis of The Ability to Understand Mathematical Concepts of High School Students in Class X on Vector Material. International Journal Of Humanities Education and Social Sciences (IJHESS) . 3, 1 (Aug. 2023). DOI:https://doi.org/10.55227/ijhess.v3i1.610.