Meta-analysis of the studies related to the student's mathematics performance

The purpose of this research was to combine the quantitative results of the researches related to the student's math performance. For this purpose, all studies which have been done in Iran from the year 1381 to 1388, were collected, using the quarterly and scientific-research articles. In general, 40 cases of them, had meta-analysis measuring features, in particular the effect size measuring feature. The Hodges’s method has been used for meta‌analysis and the Cohen’s method has been used for interpreting the findings. The results indicated that there is a significant relationship between math performance and selfe-fficacy, self-regulation, motivation, goal orientation, learning strategies, teaching methods, cognitive styles, reading styles, gender, and perception of the class structure. Among the mentioned variables, self-efficacy was found to be the best predictor of students’ math performance due to its high level of variance.