Reskina, Sehatta Saragih, Elfis Suanto, and Maimunah. 2023. “Student Errors Analysis Problem-Solving Based Castolan Theory on Relations and Functions Material”. Numerical: Jurnal Matematika Dan Pendidikan Matematika 7 (1):157-66. https://doi.org/10.25217/numerical.v7i1.2895.