The aim of our study was to examine prospective secondary mathematics teachers' reflections about teaching after their first teaching experience. We carried out five interviews during the two semesters with four Turkish prospective secondary mathematics teachers. The data analysis suggests that prospective secondary mathematics teachers' reflections based on their pedagogical content knowledge differs according to their experience. After "Teaching methods in mathematics education" course, we determined that prospective secondary mathematics teachers were willing to apply group working activities in the classroom. During "School experience" course, were cognized that prospective secondary mathematics teachers' ambition of applying student-oriented and group working activities in the classroom were decreased.