Concept mastery is the level of learning outcomes where students can explain or define lesson concepts using their own sentences or parts of them. This research approach uses a qualitative descriptive method. Qualitative research is about describing the meaning of data or phenomena that can be captured by researchers, by showing evidence. The meaning of this phenomenon depends a lot on the researcher's ability and sharpness in analyzing (Abdussamad, 2021: 30-31). The results obtained from this research come from documentation data. From the documentation data, 24 students will analyze the understanding of mathematical concepts in class X AKL SMKS SEMESTA, Depok. The results per category can be concluded that there are 15 respondents or 64% of students who have a high level of ability to understand mathematical concepts in logarithm material with high criteria, then there are 7 respondents or 29% of students who have a level of ability to understand mathematical concepts of logarithm material with medium criteria, and there are 2 respondents or 8% of students who have a low level of ability to understand mathematical concepts regarding logarithm material..
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