The aim of this research is to know the influence of cooperative learning method, in this case STAD towards the student\u27s mathematical representation ability in linear program material in MA Darul Ulum. The method used was Experimental in form of Pre-Eksperimental Design. The sample used in this research were the students in Grade XI IPA B as an experiment class. Based on the data analysis, the researcher found out that STAD brings positive influence towards student\u27s mathematical representation ability. The increasing of mathematical representation ability was counted by the use of N-Gain score formula which proved the increasing happened around 0,88 (88%). It shows the increasing that happened n-gain g> 0,7 which means in the high category
