IMPROVING HIGH-LEVEL THINKING SKILLS BY DEVELOPMENT OF LEARNING PBL APPROACH ON THE LEARNING MATHEMATICS FOR SENIOR HIGH SCHOOL STUDENTS

This study aims to improve the ability of high-level thinking by developing learning models based on problems in senior high school students. The type study is research development. The subject of dissemination consists in 3 district/city in North Sumatera, namely: SMK Negeri 6 Medan, MAN Deli Serdang District and SMA Yapim Taruna Langkat District, SMA YPK Medan City. Instrument of Collecting data used are observation guidelines, questionnaires, interview guides, students mathematics text books for 11th grade in Senior high school, Teacher’s guide book, instrument of pre-test and post-test. Development of model is adopted from Thiagarajan’s model and Semmel & Semmel’s model. This study has compiled teaching materials in the form of textbooks for students’ and teacher’s guide book that includes the structured steps of solving mathematical problems based on problem solving which can construct high-level thinking. Results of dissemination showed a significant improvement of students’ problem solving ability in three districts/cities in North Sumatra at four schools.