INCREASE THE STUDENTS’ ABILITY IN MATHEMATICS PROBLEM SOLVING ON STUDENT FIFTH GRADE SD NEGERI 064997 KECAMATAN MEDAN LABUHAN THROUGH REALISTIC MATHEMATICS EDUCATION

-the aims of this study were to: (1) increase the student’s ability of problem solving, and (2) discover the effectiveness of realistic mathematics education in student’s learning mathematics. This study was a classroom action research which was conducted in the fifth grade sd negeri 064997 kecamatan medan labuhan by the number of student’s 19 people. The instuments used to collect data, which were consisted of test, observation of student’s and teacher activity sheets, and student respond questionnaire. The RESULTS of this study are: (1) realistic mathematics education can increase student’s ability of problem solving, for the classical completeness increased in the first cycle was 65,20%, in the second cycle to 70,40%, and in the third cycle to 80,45%, and (2) implementation of realistic mathematics education in the student learning process is effective because (i) classical completeness was 88,89% exceed up to criteria 85%, (ii) mastery learning objectives in the third cycle was 88,88% who achieve mastery of learning objectives by 75% for each individual, (iii) percentage of students activities observe with “moderate” category was 77,78% at the first meeting and at the second meeting was 86,8% in the third cycle, for ability of teacher to manage learning was 83,33% exceed up to criteria 80%, (iv) time efficiency, implementation of learning has been implemented in accordance with the time on the lesson plan (v) student’s response to realistic mathematics education is very good, student’s respond questionnaire score is 81,25 at third cycle. The recommendation for the teacher to teach realistic mathematics education as one of alternative effort to increase student’s ability of problem solving