Obasi, Chinedu, Department of Mathematics, Alvan Ikoku Federal College of Education, Owerri, Imo State (Nigeria)
Octaria, Dina, Universitas PGRI Palembang, Palembang (Indonesia)
Octizasari, Ginta, Postgraduate of the Mathematics Education, University of Bengkulu, Bengkulu (Indonesia)
Opticia, Nerva Nur, Magister of Mathematics Education, State University of Surabaya, Surabaya (Indonesia)

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