This research is aimed  to improve mathematics students learning outcomesin elementary school, especially on folding symmetry and rotary symmetry materials throughthe implementation of cooperative learning on STAD. This research was a classroom action research refferedto Kemmis and Mc Taggartâ??s design, which includes planning, acting, observing, and reflecting. The research subject were all the student of fifth grade  in SDN 1 Ketajen Gedangan Sidoarjo in  the  the period of 2017/2018. After the action is applied, average value in the test resultson cycle I is 61,66 while average value in the test resultson cycle II is 70.Keywords: STAD model, mathematics study result 
                        
                        
                        
                        
                            
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