PENERAPAN MODEL PEMBELAJARAN BERBASIS MASALAH (PROBLEM BASED LEARNING) UNTUK MENINGKATKAN HASIL BELAJAR MATEMATIKA SISWA KELAS VIII.2 SMP NEGERI 4 PEKANBARU

Abstract : Th is research is classroom action research that aims to improve learning process and to increase mathematics achievement with app lied the learning model of Problem Based Learning . The subject of th is research is student of class VIII.2 SMPN 4 Pekanbaru in the second semester academic years 201 4 /201 5, which amounted to 34 students, consist of 1 3 boys and 21 girls . The research consisit of two cycles, each cycle has four stages, which are planning, implementation, observation, and reflection . At the end of every cycle the quiz will be implemented. Data collect ion is done by observation and tests in the form of quiz. The result of r esearch shows that implementation of learning process on cycle II had happened improvement from implementation on cycle I. Weakness on cycle I is improved on implementation cycle II according with planning of improvement after reflection cycle I. Most of students were very confidenced  and active d in learning process, such as while they were finished mathemathic’s problems that given, presenting the result of problems and giving the conclusion of learning. N umber of students that reach Minimum Mastery Criteria increase from basic score to quiz I and II . The number percentage of students who reach Minimum Mastery Criteria on basic, quiz I and II  are respectively 67,65%, 79,41% and 79,41 %. Results of this research indicates that appication of the learning model of Problem Based Learning can improve learning process and increase mathematics achievement from the students at class VIII.2 SMPN 4 Pekanbaru in the second semester academic years 201 4 /201 5 . Key W ords: Mathematics Achievement , Problem Based Learning, Class A ction R esearch