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National Seminar of Mathematics and AppliedĀ [9th SiManTAP] in 2018 Mathematics Education Program, Faculty of Teacher Training and Education University of Muhammadiyah Sumatera Utara Jl. Kapt. Muchtar Basri No. 3, Medan-Indonesia. Email: simantapumsu@gmail.com ; Contact Person: Tua Halomoan {081361300878} Irvan {081361443305} Zainal Azis {08126060692}