Developing Instructional Materials Complement of Set Based On Indonesian Version of Realistic Mathematics Education in 7th Grade of Junior High School

摘要

This study aims to development assessment instrument in Indonesian version of Realistic Mathematics Education (PMRI) with the material is a complement of a set and difference of two sets in student’s book form where the student’s book is valid, practice, and must have potential effect. The methodology used in this study is development research where there are analysis, design, evaluation, and revise. This form of research consists of self evaluation and prototyping. The college data were using observe, test, and documentation. The subject of this study is 31 students in 7th grade of SMPN 1 Palembang. Expert review and documentary analysis were used in collecting data. For evaluating process, observation sheet, learning log, the use of student’s strategy and solution from the result of their achievement. The collected data were analyzed using qualitative descriptive. The findings show that assessment instruments in PMRI in the topic special a complement of a set and difference of two set. Could be categorized as valid, practical, and effective. The validity is measured by using the aspects of contents, construction, and language based on assessment’s principles of PMRI. Based on the expert comments, the assessment instruments developed can be practically in the teaching learning process. The result of this study is the student is very happy and enthusiastic in their study. And then the students show positive attitude in mathematics study. It can saw from their commenter and the result of observe. The effect potential shows that 12 students have very good category and 14 students have good category, so it can call student’s understanding of concept is good.udKeywords: Development research, Set, PMRIud