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Upaya Meningkatkan Hasil Belajar Matematika Materi Pemecahan Masalah Perbandingan dan Skala Melalui Kombinasi Model Student Teams Achievement Division (STAD), Team Assisted Individually (TAI) dan Numbered Head Together (NHT) Dibantu Media Audio Visual Pada Siswa Kelas VB SDN 4 Sungai Besar Banjarbaru