Peningkatan Hasil Belajar Matematika Melalui Model Pembelajaran Problem Based Learning (PBL) Siswa Kelas 4 SD. JM [Internet]. 2019 Apr. 15 [cited 2026 Jun. 30];3(2):71-8. Available from: https://ejurnal.mercubuana-yogya.ac.id/index.php/mercumatika/article/view/694