The aim of this study is to investigate the generalization skills of 9-11th grade students according to grade and academic success. Case study, one of the qualitative research methods, was used.63 students from the 9th grade, 56 students from the 10th grade, and 61 students from the 11th grade have participated to the study in the 2019-2020 academic year from a private Science high school. The data were collected with the cube breaking question. Content analysis was used in the analysis of the data. The findings obtained showed that students from 11th grader were more successful when generalizing but students from 10th grader could not reach generalization. At the same time, when generalization skills are compared according to academic success, it is determined that the thinking processes in the generalization process differ according to academic success.
Key words: Generalization, generalization strategies, mathematics education, academic success
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