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The purpose of this research is to describe the effectiveness of learning devices based on RME approaches, improving students ' mathematical problem-solving skills through a developed RME-based learning tools, and student response to RME-based learning devices developed for high school class X learners. Learning devices developed in the form of learning Leson Plan and student Worksheets. This type of research is development research. The model of development used is a Plomp model consisting of three stages that is preliminary research, stage of development or the development or prototyping phase, and assessment phase. In this section the researcher only discusses about research at the preliminary research. At this early investigative stage, researchers used several instruments in the form of validity test sheets, practical test sheets, and an introductory test sheet. Data analysis results show that students ' mathematical problem solving skills are still low because learning devices do not yet support learners to improve their problem solving skills, the learning process still Focused on so that there has been no visible interaction between teachers and students as well as fellow learners, less engaged learners in the learning process. KeyWord: Learning, RME, mathematical problem-solving.

Development of Learning Tools Based on Realistic Mathematics Education Aproaches to Improve the Mathematical Problem Solving Skills at X Grade in High School