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The role algebra in mathematics is important because it relates to other materials such as geometry, calculus, basic matrices, trigonometry, statistics, vectors, and other mathematical studies. However, students- mistakes in solving algebraic fractions are often found due to the fact that students- are lack in understanding the algebra and arithmetic. Therefore, in this study, researchers interested to analyse some students- errors by AVAE Categories in the topic on algebraic fraction. The sample in this study was 30 junior high school students. The data was collected by test of simplifying algebraic fraction. The data were used to analyse the students- error using AVAE (Arithmetic, variables, algebraic expression, and equal sign) categories and eight of them were interviewed. The results showed that students had difficulty in understanding arithmetic and algebraic expressions