“THE OPTIMIZING OF STUDENT’S MATHEMATICAL THINKING SKILLS THROUGH MATEMATIKA NALARIA REALISTIK IN MATHEMATICS OLYMPIAD TRAINING AT MADRASAH IBTIDAIYAH” (2020) Al-Bidayah : Jurnal Pendidikan Dasar Islam, 12(1), pp. 97–110. doi:10.14421/al-bidayah.v12i1.305.