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ANALISIS EFEKTIVITAS MODEL PROBLEM BASED LEARNING DALAM MENINGKATKAN HASIL BELAJAR IPAS SISWA KELAS VI UPT SDN 90 SAMPULUNGAN. Sindoro. 2026;18(3):491-500. Accessed October 2, 2026. https://cibjournal.com/index.php/sindoro/article/view/5584