H.S., Dyan Wulan Sari, Department of Primary Teacher Education, FKIP, Universitas Katolik Santo Thomas, Medan 20132 (Indonesia)
Harahap, Tua Halomoan, Department of Mathematic Education, Faculty of Teacher Training and Education, Universitas Muhammadiyah Sumatera Utara, Sumatera Utara (Indonesia)

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