Development of realistic mathematics education (RME) based learning tools on the topic of ratio

This study aims to develop an RME learning pack on ratio topic which consist of Model Book, Teacher’s Book, Student’s Book, Lesson Plan, Worksheets and Evaluation sheets. The development model used was Plomp Model that had been modified by the product quality by Nieveen. The development of the model consisted of the preliminary investigation, design, and evaluation. Valid and practical criteria were obtained based on expert judgment. While the effective criteria are obtained based on the students’ learsning mastery; student and teacher activities; student responses; and the ability of teachers to manage to learn. The results find that the product was valid, practiced, and effective. Validation results show that the validation score was 4.19. The practically was acquired by the consistency of practice evaluation scores from expert and learning monitoring results. The effectiveness was acquired by four indicators, namely: 1) 80% of 35 students gain high or very high score, 2) percentage average of students and teachers activities gain ideal tolerance time, 3) 92.5 % of students give a positive response on learning, and 4) Teacher’s ability to administer to learn the process on good category. Based on the results of this study, it is suggested that by using a realistic mathematics learning model, students are easier to construct mathematical ideas and concepts, students become skilled in solving problems so that a positive attitude to-wards mathematics grows.