DEVELOPMENT OF LEARNING TOOLS BASED ON REALISTIC MATHEMATICS EDUCATION OF ETHNOMATEMATICS NUANCES TO IMPROVE MATHEMATICAL COMMUNICATION SKILL STUDENTS IN JUNIOR HIGH SHCOOL 2 PERCUT SEI TUAN

Realistic mathematics education of ethnomatematics nuances is an activity which emphasizes students' activity to seek, find, and build their own knowledge from various problems that nuanced local culture. Development of learning tools based on realistic mathematics education of ethnomatematics nuances aims to know: 1) Validity, practicality and effectiveness of learning devices developed, 2) Knowing the improvement of students' mathematical communication skill using learning tools developed. This research was a research development (research and development), using 4-D model developed by Thiagarajan, Semmel and Semmel. The result was the implementation plan of learning, students’ book, students’ activity sheet and students' mathematical communication skill test. Subjects of this study were students of class VII-4 and VII-5 SMP Negeri 2 Percut Sei Tuan. The result of experiment I and experiment II were: 1) instructional device fulfilling valid, practical and effective criteria, 2) the improvement of mathematical communication skill of students obtained from improvement of average indicator of mathematical communication skill from experiment I to experiment II