PENERAPAN MODEL MASTERY LEARNING DALAM MENINGKATKAN PENGUASAAN KOMPETENSI DASAR MATEMATIKA SISWA SEKOLAH DASAR. SOSPENDIS [Internet]. 2026 May 15 [cited 2026 May 29];4(3):327-36. Available from: https://lawinsight.net/index.php/SOSPENDIS/article/view/992