A meta-synthesis related to the studies which are made on geometric thinking in Turkey

In this study between 1999 and 2014 in all education stage Van Hiele Geometrical thinking placement test' has been included by in the way of inclusion, exclusion 36 post graduate, doctoral thesis and 20 scientific article prepared by using qualitative or quantitative research method which can serve to the aim of this meta-synthesis study.This study has been planned to review the relate litreature about geometrical thinking and to review the studies which were made on this subject, to study the findings and to reach the meta-synthesis with all resembling and labile sides.The aim of this study is to reveal by using the meta-synthesis method the geometrical level of the preschool, secondary education and licence graders on the basis of the studies which were performed. With this study, we aimed to reveal the results of research carried out in geometric thinking in Turkey. Addressing the broad framework of the current situation in our country and yet in terms of being in the nature of a study will reveal that this research shows significant.The level of Van Hiele Geometrical thinking of the students in all samples has been estimated to be quite low. It has been determined that preschool, secondary and licence graders were faild to reach the level of geometrical thinking which they need to learn. It ıs needed to teach lesson according to the geometrical level of the student. So in order to do this students' level of geometrical thinkiing and preparedness must be considered in all grades and the education must be suitable to the level of the present geometrical thinking. The training which is not suitable for the level of the student hampers the learning, the findings on the different age and grades also show students' geometrical thinking level is related to geometrical experience more than age or maturation.