Increasing students' mathematics learning levels via lesson study

The aim of the study was to test effect teachers’ professional development upon students’ mathematics academic achievement levels with help lesson study. In this manner, aimed at increasing learning via Action research used as method in sample consisted 32 6th- grade students who were studying school having lower success. Four different outcomes about “natural numbers activities” tried develop process implementation called “the natural data collection instrument which developed by researchers. According findings study, there significant difference between successes students. Lesson is designed support choosing a lesson, subject and an aim. study’s results, it seen that plan, new teaching strategies materials, prepared views altogether, made qualities increase also reasoning.