The increase of the Ability to Reason Math and Students’ Self Convidence about Addition and Subtraction of Fractions Through Problem Base Learning Strategy in Class IV SDN 04 Muaro Sei Lolo Pasaman district

Mathematical reasoning ability and students’ self convidence of fourth grade SDN 04 Muaro Sei Lolo Kab. Pasaman disrict still low. This can be seen from the observation and analysis of learning outcomes in the form of replay value. The problems were solved by the implementation of Problem Based Learning strategy (SPBM). The purpose of this study was to describe the increase in the ability to reason and students’ self convidence by using SPBM mathematical strategy. This type of research is a classroom action research that conducted in two cycles. Every cycle consists of four stages: planning, action, observation, and reflection. The subjects of the research is the fourth grade students by the number of 26 students. The data were obtained through observation sheets, notes field, and test. The data were analyzed qualitatively and quantitatively. These research’ results indicate the increase in mathematical reasoning ability and stydents’ self convidence by using Problem Based Learning strategy (SPBM). The increase was seen with untrained students in the learning Problem Based Learning strategy process such as: students are accustomed faced with a problem, find their own patterns to make generalizations, in collaboration completing worksheets in the study group, briefed the friends in the group, the opinions of friends, reported the results of a discussion group next class, and the invisibility of changes in student’ learning outcomes. In addition, students have been able to work with good, responsible, and respect the opinion of outhe classmates. The first cycle I, the average students’ mathematical reasoning ability 66.46%; cycle II, 76.13%. The level of the first cycle students’ self convidence, an average of 63.12%; cycle II, 73,65% in the second cycle. The success of reasoning ability and students’ self convidence also led to increased cognitive learning outcomes of students. In the first cycle I the average learning outcomes students’ cognitive 73.07%. Cycle II of 80.77%. With this, Problem Based Learning strategy (SPBM) can improve math reasoning abilities and students’ self convidence .