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Mathematical representation is one of the fundamental abilities used in mathematics to build the connection between abstract ideas and logical thinking to understand and solve mathematics problems. The level of student representation ability will affect the way students convey the idea of solving mathematics problems. This shows how important this ability is in mathematics. But in fact, the ability of mathematical representation is felt to be less comprehensively mastered. This is indicated by the large number of students having difficulty conveying their ideas in solving mathematics problems. This paper describes students' abilities in mathematical representation to solve math problems. The indicators for mathematical representation ability in this research are classified as verbal representation (written text), visual representation (picture, diagram, graph, or table), and symbolise representation (mathematical statement, numerical/algebra symbol, mathematical notation). The subject of this research was 8-grade students of one of the junior secondary schools at Bukittinggi. The results showed that 22 out of 34 students have difficulty in conveying their ideas to solve math problems, while the rest feel quite good about it. [ABSTRACT FROM AUTHOR]

This paper analyzes students' errors at X MIPA 4 SMAN 1 Ampek Angkek, and it causes in solving vector based on Castolan. The type of research is descriptive with a qualitative approach—data analysis through reduction, display, and conclusion. The result showed that 1) around 66,66% of students made a conceptual error in vector operation, 33,33% in measuring the angle between two vectors, also 55,55% in orthogonal vector. 2) around 44,44% of students made a procedural error in measuring the angle between two vectors. 3) around 11,10% of students made a technical error identifying three collinear points. The cause is students' carelessness and does not recheck the answers. [ABSTRACT FROM AUTHOR]