Sugiarni, Rani, Tatang Herman, Didi Suryadi, Sufyani Prabawanto, and Nia Jusniani. 2025. “Learning Obstacle of Proportion Learning Based on Proposional Reasoning Level: A Case Study Pre-Service Mathematics Teachers”. Jurnal Elemen 11 (1):87-107. https://doi.org/10.29408/jel.v11i1.27418.