This type of research is Classroom Action Research. From the results of the analysis of student learning outcomes, the average class in the first cycle of learning is 59.69 while the percentage of classical learning completeness in the second cycle is 80.95% of students declared to have completed learning. There is an effect of the STAD type cooperative learning method on the mathematics learning outcomes of students of class VI A SDN Kewall on data processing materials. Then the use of the STAD cooperative learning method on the mathematics learning outcomes of class VI A SDN Kewall students in data processing material increased by 21.26%.