Susylawati Sinambela

Susylawati Sinambela, 081188710019. Improvement of Ability Opend Ended Mathematics Problem Solving through Approach of Investigation of Mathematics to V Country Elementary School Class Student 064956. Thesis Mathematics Education Graduate Program, State University of Medan. 2011.

Research objectives are: (1) Knowing do approach of investigation of mathematics can improve ability open mathematics problem solving (2) Knowing how student activity rate and teacher in study through approach of investigation of mathematics.Type of research is the Classroom Action Research (CAR). Research Subyek is elementary school Country student 064956, the class V SD Science Program in Academic Year 2010 / 2011 with the number of students as many as 30 students with heterogeneous ability levels. The object of research is the use of approach of investigation of mathematics. Data was obtained from the initial and final test on ability opend ended mathematics problem solving, teacher observations and student.This study consisted of two cycles. Each cycle spent four meetings. Starting from October 15, 2010 until November 05, 2010. The result is (1) Approach of investigation of mathematics can improve ability of student mathematics problem solving. (2) Approach of investigation of mathematics can improve student activity rate. From the test results obtained value of prerequisite items - average opend ended mathematics problem solving of the mathematical ability of students is 3,17, the value - average student test first cycle was 10.73 or 56,66% and the average test scores of students of second cycle was 12 or 83,33%.Based on the above conclusion, this study suggests (a) study of mathematics by applying approach of investigation can improve ability of open mathematics problem solving. (b) study with approach of is investigation of mathematics can improve activity learn student.

Keyword : Opend Ended Mathematics Problem Solving, Investigation of Mathematics