The aim of this study is to determine the effect of the use of concept cartoons on the academic achievements of students in a mathematics course. The model of the research is based on a quasi-experimental design from quantitative research methods and supported by an interview from the qualitative methods. The purpose of qualitative data collected by interviewing teachers is to support quantitative data. For this reason, a triangulation mixed design was used in the research. A total of 67 (35 experimental-32 control) fourth graders constitute the participants of the study. The "time measurement success test" developed by the researchers was used as a data collection tool. In the four-week practice, the experimental group was taught with concept cartoons, and in the control group, lessons were taught taking into account the classic approach. According to the results, a significant difference was determined in terms of the academic achievement in the mathematics course between the experimental group in which concept cartoons were used and the control group in which the classic approach was used.