Teaching and learning process of teachers and students requires the ability of mathematical representation to convey ideas in understanding a concept or the process of solving mathematical problems. Mathematical representation is used by teachers to find out how students think individually about a mathematical context that they learn.

The purpose of this study was to determine the mathematical representation of junior high school students in solving mathematical problems in terms of the level of mathematical ability. Forms of mathematical representation which used are visual representations in the form of images, graphs and tables, symbol representations in the form of mathematical notations / expressions and verbal representations in the form of texts / written words.

The results showed that students' mathematical abilities influence the forms of mathematical representation of junior high school students in solving mathematical problems. Students with high mathematical abilities combine all forms of representation to solve problems. Students with medium abilities are combining symbol, table, and verbal representations. Students with low mathematical ability combine the symbol representation with verbal to solve mathematical problems.