Rifai, Rusdian, Turmudi, Jarnawi Afgani Dahlan, and Suhendra. “The Effect of Open-Ended Approach on Enhancing Mathematical Understanding in Vocational High School Students”. Kalamatika: Jurnal Pendidikan Matematika 10, no. 2 (November 18, 2025): 58-72. Accessed March 4, 2026. https://www.matematika-uhamka.com/kalamatika_old/index.php/kmk/article/view/711.