An Implementation of Problem Based Learning Model to Improve Mathematics Solving Problem Ability of the Students Class XI MIA SMA Negeri 4 Gorontalo Utara. JM [Internet]. 2022 Jan. 26 [cited 2026 Jun. 30];6(1). Available from: https://ejurnal.mercubuana-yogya.ac.id/index.php/mercumatika/article/view/2126