Data Collection Tool and Analysis of Data
Achievement test was prepared to measure the students' knowledges about GCD-IPPC and their achievement in the end of the research was prepared for applying as pre-test and post-test in experimental and control groups. There are 10 multiple-choice questions in this test. Mathematics teachers and the instructors in this field are asked to verify
the content validity of the test and it has been guaranteed that the test assesses the targeted subject in the teaching of mathematics program in the light of these views. The answers to the questions have been graded with 1 point if they were correct, the answers to the questions have been graded with 0 point if they were wrong or if no answer was
given. Numeric data obtained by grading the questions have been evaluated in SPSS for Windows (Statistical PacKage for the Sciences) computer program. Cronbach's Alpha coefficient has been calculated and measurement reliability has been found as .81. It was informed to students in the experimental group about group work that learning together of cooperative learning techniques was applied during application and it was shown how to create these groups. Students in the experimental group ( considering factors such as success, gender) divided into groups. After sharing the task, work sheets related to GCD-IPPC problems were distributed to the students in experimental group in mathematics class. During group work, researcher as a guider gave informations
only about unclear points to the students. Mean scores of control groups and standard deviations of score distributions were calculated analyzing research data. Independent t-test was used in between-group comparisons.Score differences between the groups and wheter these score differences are significant during interpretations were based.