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K. TAMPUBOLON, “UPAYA MENINGKATKAN HASIL BELAJAR SISWA DENGAN MENGGUNAKAN MODEL PEMBELAJARAN PROBLEM BASED LEARNING PADA PADA MATA PELAJARAN MATEMATIKA KELAS IV SDN 106788 PURWODADI KECAMATAN SUNGGAL KABUPATEN DELI SERDANG TAHUN PEMBELAJARAN 2018/2019”, AQUINAS, vol. 2, no. 2, pp. 272–289, Nov. 2019.