Implementationof this research effort to improve the learners' learning activities using the method of problem solving in mathematics teaching fourth grade Elementary Shcool 07 River Pinyuh Pontianak. This research method is descriptive method, a form of research that is action research (PTK), the nature of qualitative research, research subjects that teachers and leaners Elementary School fourth grade 07 Pinyuh Pontianak River totaling 26 people. The purpose of this study is to obtain information and clarity about the actual increase in the activity of leaners in learning of mathematics by using problem-solving method in class IV Elementary school 07 River Pinyuh Pontianak. From the results of this study concluded: 1) the physical activity of students in the base line was 23,07% and second cycle was 85,25% in creased by 62,18% in the high category, 2) the mental activity students in the base line by 12,17% and scond cycle was 82,99% increased by 70,82% in the high category, 3) emotional activity learners 32,04% on the base line and the second cycle was 92,30% increased by 60,26% the high category