Abstract
The purpose of this paper was to enhance Grade 11 Thai students? concept of “Permutation and Combination.” The participants included 35 Grade 11 students in Khon Kaen University Demonstration Secondary School (Suksasart), Khon Kaen, Thailand in the academic year of 2018. The students were studying with adoption of Lesson Study Innovative mathematical learning activities to acquire knowledge of permutation and combination by using Open Approach. The methodology used in this study was in the interpretive paradigm. The students? concept about permutation and combination was interpreted through students? tasks and class observation. The interpretation considered on how and what teachers? understanding on students? learning on permutation and combination. The findings revealed that students held several ideas for their solving problem development in the lessons of permutation and combination. The study discussed and identified key students? solving-problem learning, which further highlighted the implications to enhance students? learning on mathematics performance based on lesson study and open approach in Thailand.
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