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Peningkatan Hasil Belajar Matematika Siswa Kelas IV SD Negeri 44 Cakranegara Melalui Model Problem Based Learning (PBL). JCPSD [Internet]. 2025 Jun. 15 [cited 2026 Jun. 12];1(1):1-12. Available from: http://jcpsd.id/jcpsd/article/view/1