Abstract:The aim of the study was to test the effect of teachers' professional development upon students' mathematics academic achievement levels with the help of lesson study. In this manner, the study aimed at increasing students' mathematics learning levels via lesson study. Action research was used as research method in the study. The sample of the study was consisted of 32 6 th -grade students who were studying at the school having lower academic success. Four different learning outcomes about "natural numbers act… Show more
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