Recent studies in math education focus on differences between behaviors and performances of male and female students. In this study, achievement and attitudes of middle school students to math were described in terms of gender and grade differences. The aim of this study is to determine whether any differences exist between female and male students' attitudes and successes of middle school toward mathematics. This research was designed as a descriptive research. Students (6th, 7th, and 8th grades) were registered to "Attitude Survey toward Mathematics." This survey is consisted of two parts. In the first part, there are demographic questions. The second part is 5-Likert type survey which is intended to learn students' attitudes toward mathematics. Secondly, in order to determine students' achievements from mathematics, their grades and their state exam results were used. Because of the possibility of differentiation in teachers' evaluation criteria and their objectivity on students' successes, both students' scores from state exam and their course grades were included to the analysis. The findings of this research indicate that attitude of the students toward mathematics and achievement scores in Mathematics have a significant difference in terms of their gender and grade levels. Female students performed more positive attitudes than male students toward Mathematics and female students had higher grades than male students.