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), pp. 58–72. doi: 10.31949/th.v11i1.16192.