Natasya Grabiella Sitorus, Theresia Monica Siahaan, Asister Fernando Siagian. PENGARUH MODEL PROBLEM BASED LEARNING (PBL) TERHADAP KEMAMPUAN PEMECAHAN MASALAH MATEMATIKA SISWA DI KELAS 4 SD NEGERI 122355 PEMATANGSIANTAR. IKRA-ITHABDIMAS [Internet]. 2026Nov.3 [cited 2026Nov.9];10(3):34-9. Available from: https://journals.upi-yai.ac.id/index.php/IKRAITH-ABDIMAS/article/view/7710