Improving The Mathematic Critical And Creative Thinking Skills In Grade 10th SMA Negeri 1 Kasihan Bantul On Mathematics Learning Through Problem-Based Learning

This research aims to describe: (1) implementation of the PBL that improve the mathematic critical and creative thinking skills and (2) improvement the mathematic critical and creative thinking skills of students with PBL. The research is Classroom Action-Research, which is consisted of two cycles. The research was conducted in SMA Negeri 1 Kasihan Bantul in August until December 2010. The subjects were all of the students in class X D which consist of 33 students. The data was obtained from observation sheet, field notes, documentation, interviews, and tests of critical and creative thinking skills in mathematics learning. The data validation has done by triangulation. The results shows that the implementation of the PBL which can improve the students’ mathematics critical and creative thinking skills consist of four steps: (1) engagement, (2) inquiry and investigation, (3) performance, and (4) debriefing. Keyword: critical thinking, creative thinking, problem based learnin