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This study aims to describe the students' written mathematical communication skills in using open ended-based teaching materials in class VIII function relations material. The type of research used is descriptive qualitative. The research subjects were 5 students of class VIII E SMP. Data collection techniques in this study in the form of tests and interviews. The research results obtained by students in the category of high written mathematical communication skills have the ability to convert questions into set notations, students are quite capable of transforming mathematical information into images and students are able to use mathematical information to solve problems. Students with written mathematical communication skills have sufficient ability to convert mathematical information into set notations, students are less able to convert mathematical information into images and students are able to use mathematical information to solve problems. Students with low communication skills seen from students are unable to change questions into set notations, students are less able to convert mathematical information into images and students are unable to be able to use mathematical information to solve problems.

Analysis of Students 'Mathematic Ability in Using Open Ended Teaching Materials on Class VII Function Relations Materials