The aim of the present study was to investigate the quantitative and qualitative effect of sixth grade mathematics teaching in flipped on the learning outcomes of cognitive domain. , Quasi-experimental method was used and in the qualitative method, semi-structured interviews and observation were used.The statistical population of the study included all sixth grade male and female students in Pirbakran region. The sample included 16 sixth grade male and female students. Mathematics topics were taught in two ways, normal and flipped, using pre-test and post-test in two groups of control and experiment.Quantitative data were analyzed in two levels of descriptive and inferential statistics, and in the qualitative part, interviews with students, parents and teachers were coded and categorized. Findings showed that students' scores on superficial and simple cognitive outcomes in flipped and normal education were not significantly different between the two methods, but the flipped method improved the scores of male and female students in complex and deep cognitive outcomes and improved performance. Students became cognitive in complex and profound outcomes.Also, flipped education did not have a significant effect on the mentioned components on girls and boys. In addition, students 'independence in learning mathematics and students' activities at home in the flipped classroom increased; It also solved the problem of lack of teaching time in person, especially during the coronary heart disease epidemic.