This study aimed at knowing the effect of the STAD type Cooperative learning model assisted by GeoGebra on mathematics learning outcomes in terms of students' initial knowledge. This research used quasi-experimental study with a 2x2 research design. The population of this study was all first semester students of the Informatics Engineering Department of STIKI INDONESIA. Sampling was done by cluster random sampling technique where the sample obtained was 72 students. The prior knowledge data was collected through prior knowledge tests and mathematical learning outcome data collected through tests of mathematics learning outcomes in the cognitive domain. The data obtained were analyzed using analysis of variance (ANOVA) two lanes with the help of the SPSS 20.0 for Windows program at a significance level of 5%. The results showed that (1) the learning outcomes of students who were taught by the GeoGebra-assisted STAD type cooperative learning model were better than student learning outcomes taught with conventional learning models, (2) there was no interaction between the GeoGebra-assisted STAD type learning model and prior knowledge towards the results of student mathematics learning. Student mathematics learning outcomes both in students who had high prior knowledge and low prior knowledge were always better if they were taught by GeoGebra assisted STAD type cooperative learning model.
                        
                        
                        
                        
                            
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