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This study aims to determine whether there are differences in understanding of mathematical concepts between students who get learning with Flipped-Mastery models and students who get conventional learning. This study was a quasi-experimental study with a nonequivalent pretestt posttest control group design. With a population of all class students of SMA N 1 Pandeglang, and the sample was students of MIPA X-4 class as an experimental class and MIPA X-5 class as a control class. The instrument used is a concept understanding test instrument consisting of 8 essay questions. Data analysis using the t-test with a pre-requisite test for normality and homogeneity. The results of the study showed that understanding the mathematical concepts of students who had learned Flipped-Mastery models was better than students who obtained conventional learning.