“Teachers’ learning together” is a key concept for the success of teaching professional development. This study aimed to analyze the pre- and in-service teachers’ role to enhance teaching and learning of mathematics. Mixed methodology was administered. The target group includes 44 lesson study teams. Data were collected by using a questionnaire and video tape recording and were analyzed by statistics and video analysis methods. The findings showed that most of teachers collaborated in analyzing the problems of instruction, observing the students’ ideas, and observing the lesson in open class activities. These teachers’ role is the key component for improving teaching and learning of mathematics.
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