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PENERAPAN MODEL PROBLEM BASED LEARNING DALAM MENINGKATKAN HASIL BELAJAR MATEMATIKA SISWA SDI WATU WANGKA, KECAMATAN PACAR. JLPD [Internet]. 2022 Apr. 20 [cited 2026 Aug. 2];3(1):62-8. Available from: https://jurnal.unikastpaulus.ac.id/index.php/jlpd/article/view/2101