The Implementation of Problem Based Learning Models to Improve Mathematical Problem Solving Ability of Students on Arithmethic Materials in Class VII Junior High School

This study aims to determine the improvement of problem solving ability of mathematics students through the model of Problem Based Learning on social arithmetic material
in class VII Junior High School. Thisresearch is Classroom Action Research (PTK). Subjects in this study were 30 students of class VII1 Junior High School. Instruments used to obtain data are tests and observation sheets. The result in cycle I shows the number of students who achieve mastery learning is 15 of 30
students or 50% with an average grade 68.25%. The result
incycle II obtained by many students who reach the
completeness of learning that is 26 from 30 students or 86.67% with the grade average 84.75%. This means an increase in problem solving ability of students from cycle I to cycle II. Based on the classical learning completeness criteria then this learning has reached the target of learning mastery. Thus it can be concluded that through the model of learning problem learning, mathematic problem solving ability of student especially the subject matter of social arithmetic was increased in class VII Junior High School Medan.