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The learning model of cooperative learning type Student Team Achievement Division (STAD) is one of the most simple cooperative learning models. The main advantages of this model lies in activity and interaction among students to motivate and help each other in mastering the subject matter, understanding the concepts, discussing in solving problems and tasks given by teacher. The purpose of this study is to test the effect of the STAD learning model on the student’s concept understanding ability. This study is a quasi-experimental research using posttest only control design. The research population is all student of fifth grade and measurement instruments using essay test. The result of measurements of the concept understanding ability of mathematic in the form of data and analyzed using t-test. Based on the data analysis, average the concept understanding ability of mathematic in the classroom experiment that is equal to 91.25, while the control class at 64.55. The results of the t-test analysis shows that t count > t table or 2,65 greater than 2,02. This mean that H0 refused and H1 accepted So there is the effect of STAD learning model on the concept understanding ability of mathematic. Keywords—concept understanding ability of mathematic; quasi-experimental research; student team achievement division

The Effect of Student Team Achievement Division Cooperative Learning on The Concept Understanding Ability of Mathematic