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This research is motivated by the importance of reflective thinking skills by applying the Realistic Mathematics Education (RME) approach. The purpose of this research to improve reflective thinking skills through the Realistic Mathematics Education (RME) approach and determine students mistakes in reflective thinking skills. The method used is Mixed Methods with the incorporation of quantitative-qualitative design. The sample in this research was grade VIII SMP Negeri 4 Serang City involving two classes, namely the experimental class, and the control class. The instruments used in the form of reflective thinking skills test instruments, non-test instruments in the form of observation sheets, documentation and researchers. The conclusion from this study that the reflective thinking skills of the experimental class are better than the control class. Student mistakes in taking reflective thinking tests include errors in making mathematical modeling, concept errors, systematic errors, and miscalculations.