IMPROVING PROBLEM SOLVING ABILITY OF ELEMENTARY SCHOOL STUDENTS BY USING PROBLEM-BASED LEARNING MODELS . Primary: Jurnal Pendidikan Guru Sekolah Dasar, [S. l.], v. 9, n. 2, p. 228–234, 2020. DOI: 10.33578/jpfkip.v9i2.7887. Disponível em: https://primary.ejournal.unri.ac.id/index.php/JPFKIP/article/view/892. Acesso em: 21 dec. 2025.