Jannah, S.M. dan Hendrayana, A. 2023. Analysis of students’ mathematical concept understanding ability in learning after covid-19 pandemic at SMPN 1 Anyar. Math Didactic: Jurnal Pendidikan Matematika. 9, 1 (Mar 2023), 86-97. DOI:https://doi.org/10.33654/math.v9i1.1991.