Abstrak
Problem solving ability is a necessary ability in dealing with problems in student life. This study aims to describe students' abilities in solving mathematical problems in flat shape material for class V B SDN 009 Malinau Utara. The type of research used is descriptive qualitative. Data collection was carried out through problem solving tests and then confirmed through interviews. In this study, 20 students from class V B were involved in taking a problem-solving ability test and the results of the students' work were grouped based on high, medium, and low mathematical ability. After that, the researcher took as many as 6 students as subjects as representatives of each category of mathematical ability to be interviewed. the result of solving this problem is that high-ability subjects can be said to have been able to fulfill the four stages of polya, but subjects T1 and T2 are still not thorough because the subject is in a hurry and feels confident about the answer. S1 and S2 subjects have not been able to fulfill the third and fourth stages because the two subjects are unable to think about and understand what steps will be used. Subjects R1 and R2 have not been able to understand what problems there are in the problem, when making plans the two subjects use inaccurate concepts and at the stage of carrying out the plans the subject is unable to solve the problem because of the inaccuracy of the concept used besides that, the subject does not look back at what has been subject to work on.