This study aims to improve mathematics learning outcomes of fourth grade students through the Scientific approach with cooperative learning in SDN 58 Lubuklinggau. This type of research is Classroom Action Research (CAR). This study uses a scientific approach to Cooperative Learning. Data obtained from the results of research, observations in learning using Scientific approaches with cooperative learning. The data analysis technique uses descriptive qualitative. The results showed that student mathematics learning outcomes have increased. This is supported by the use of the Saintifk approach with cooperative learning which emphasizes 5 aspects namely observing, asking, trying, reasoning and communicating. The increase in average student learning outcomes can be seen from the results of the initial reflection of 43.66 in the first cycle rose to 71.43, the second cycle rose to 76.84 and in the third cycle rose to 81.72. In the initial reflection of the percentage of completeness of 21.43% or 6 of 28 students, in the first cycle increased to 50% or 14 of 28 students, then in the second cycle increased by 60.71% or 17 of 28 students and in the third cycle increased by 85 71%. It can be concluded that there is an increase in Mathematics learning outcomes through the Scientific approach with cooperative learning in grade IV elementary school students. Keywords: Math Learning Outcames, Scientific Approach, Cooperative learning