THE DEVELOPMENT OF ETHNOMATEMATICS-BASED TEACHING MATERIAL WITH A MULTI-REPRESENTATION APPROACH ON THE SUBJECT OF GEOMETRIC TRANSFORMATION TO IMPROVE UNDERSTANDING OF MATHEMATICAL CONCEPTS IN THE GRADE IX STUDENTS OF JUNIOR HIGH SCHOOL

This research purposes to determine characteristics of ethnomatematics-based teaching material with valid quality, practicality and effectiveness using multi-representation approach. Teaching material is one of the efforts to improve students' understanding of geometry transformation concept. This resarch use development research from Plomp model which consists of three phases, they are Preliminary Research, Prototyping, and Assessment. The subject of the research is IX grade students of Undiksha Laboratory Junior High School in 2019/2020 school year. The method fot collecting data is questionnaire and test. Whereas the instrument is validation sheet to obtain data on validity of teaching material, sheets of teaching material implementation, questionnaire responses of teachers and students to obtain data on practicality of teaching material, and tests of mathematical concepts understanding to obtain data on effectiveness of teaching material. The result is teaching material having good quality, validity, practicality, and effectiveness. Student teaching material emphasize student-centered learning, contain problems that are close to student life, use various representations to construct understanding and initiate problems with Balinese culture. It uses carvings of traditional Balinese buildings to instill geometry transformation concept. Teacher's guidance helps teacher in learning including alternative action, answer, lesson plan that are appropriate to learning process on multi-representation approach.