Developing of Higher Order Thinking Skill (HOTS) Mathematical Problems With Cartesian Coordinate Material

This study aims to produce mathematical problems of the Higher Order Thinking Skill (HOTS) type on the Cartesian Coordinate material which are valid and practical. This study used design research of development studies type which consists of preliminary stage, self-evaluation, expert review, one to one, small group, and field test. The research subject is eight graders of SMP 17 Palembang, Indonesia. Data collected by tests, interviews, and questionnaires. The results of this study are that the questions developed are valid and practical, the validity seen from the questions is appropriate based on content, construct, and language, while practicality is seen from the questions that can be used by students and the questions can bring up students' higher order thinking skills.