IMPROVEMENT OF STUDENT MATHEMATICAL REASONING ABILITY IN VII GRADE SMP NEGERI 1 MEDAN BY APPLYING REALISTIC MATHEMATICS EDUCATION (RME)ON THE SUBJECT OF FRACTION ACADEMIC YEAR 2012/2013

The research objectives are: 1) To know is there an improvement in ability of student mathematical reasoning who studied by realistic mathematics education; 2) To find out whether by following realistic mathematics learning, student become more active interacting in learning process; 3) To find out the description of student response to mathematic for students that follow realistic mathematics learning. This research is Classroom Action Research that taken in four cycles. Each of cycle consists of four phases, namely: (1) planning phase, (2) action phase, (3) observation phase, (4) reflection and evaluation phase. This research has done in SMP Negeri 1 Medan. The research subject is students in VII Archimedes grade SMP Negeri 1 Medan, with the number of students are 29 students that consist of 13 students are boys and 16 students are girls. While, the research object is all of activities that happened in learning process to improve student mathematical reasoning ability by applying realistic mathematics education. The research results are: 1) based on observation result, student more interactive in learning process because student builds knowledge by involving students