The aim of this study is to search the effect of gamified gamification methodology on 5th grade students' achievement and attitude in Mathematics classes. In accordance with this purpose, the subject of fractions has been prepared as game based and Educational Informatics Network (known as EBA in Turkey) games and applications have been used as teaching materials. There are a total of 50 students (N=50), namely, 28 students in experimental group and 22 students in control group. In this study, mixed method has been used by combining quantitative research and qualitative research method. For the quantitative part, pretest-posttest control group quasi-experimental design have been used. Quanitative data have been supported by qualitative data, obtained from in-class observations and unstructured interviews with students. The data gained from experimental group and control group have been analyzed in the SPSS program. As a result, it has been found out no statistically significant difference between the achievement and attitude scores of the students in the experimental and control groups. However, it has been observed that the achievement of the students in the experimental group increased more than that of the students in the control group.