Sari, P.L. and Frisnoiry, S. 2026. The effect of problem-based learning model assisted by geogebra on students’ mathematical problem-solving ability in SPLDV material of 9th grade at state junior high school 45 Medan. Jurnal THEOREMS (The Original Research of Mathematics). 11, 1 (Jan. 2026), 58–72. DOI:https://doi.org/10.31949/th.v11i1.16192.