Yastri, Yastri, Universitas Sumatera Utara (Indonesia)
Yusni, Hafiza, Master Program of Mathematics Education, Universitas Muhammadiyah Sumatera Utara, Indonesia (Indonesia)
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Journal of Mathematics Education and Application: JMEA
University Muhammadiyah of Sumatera Utara
Magister Pendidikan Matematika Program Pascasarjana Universitas Muhammadiyah Sumatera Utara, Jl. Denai No 217, Indonesia