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Abstract. This study aims to explore the teacher performance in teaching understunding mathematical concepts of Junior High School. Three teachers were taken as participants. The method use in this researsh is qualitative with grounded theory design appoach. Data was obtained by analyzing the learning videos then confirmed by interviews to reveal the perceptions of the three teachers in teaching understanding of mathematical concepts. Based on data analysis, three categories of teacher performance appear, namely adequate performance, good performance and excellent performance. The three performance categories are seen from aspects of morality in teaching, reflection after teaching, effectiveness in teaching, and interaction with students. These aspects are contained in a performance rubric. Furthermore, the three categories will be described in this paper.