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Common mistakes that often do students in solving mathematical problems include errors in understanding the concepts of mathematics, errors in the use of mathematical formulas, miscalculation, misunderstanding of symbols and signs, a mistake in choosing and using the settlement procedure. The Aim of this research is to describes the mistakes of the students to solve the problem of logarithms and to know the factors that Become causes of students in making errors in problem-solving logarithms. This type of research is descriptive research with phenomenology research design. Respondents are five students of grade 10 at one of senior high school in Bandung. Data collected in this study were calculated using a test, interview, and documentation. the results of this study indicate there are three factors types of errors are Errors in understanding the concept, Errors in a calculation, and Procedural errors