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D. Suryadi

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Open access Sep 2026

Assessing the impact of mathematics textbooks on learning obstacles and student performance in systems of linear inequalities in two variables

This study aims to provide an in-depth analysis of the impact of mathematics textbooks on learning obstacles and student performance in the topic of systems of linear inequalities in two variables. Employing a qualitative interpretative approach with a hermeneutic phenomenological design, the research examines mathemat...

Anton Nasrullah, D. Suryadi, S. Prabawanto et al. · 0 citations
Open access Jul 2026

Understanding Students’ Learning Obstacles in Geometric Transformations and Their Implications for Didactical Design

Geometric transformations are one of the essential topics in mathematical learning, as they support students’ spatial reasoning, spatial visualization, and understanding of geometric relationships. Despite its importance, many students still have difficulties in interpreting transformation concepts beyond routine proce...

Pebi Pitri Anasari, T. Turmudi, D. Suryadi et al. · 0 citations

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