Abstract
This study examines factors shaping teachers’ instructions of mathematical proof in Singapore. Using a qualitative case study, two teachers’ conceptions, beliefs, and challenges were analysed. Findings reveal reliance on empirical and axiomatic proof schemes, shaping instruction. Teachers faced challenges such as limited curriculum emphasis and lack of training. Instructional gaps include insufficient focus on proof tasks and inadequate pedagogical resources. Recommendations include enhancing teacher training, curriculum integration, and assessment reforms. Addressing these issues ensures proof is integral to mathematical reasoning in classrooms.