<![CDATA[Two stay two stray is one type of cooperative learning that students seek and discover concepts independently by explaining the concept to the guests from the other group and are looking for information the results of discussion to another group. This quasi-experimental study aimed to investigate the effectiveness of cooperative learning model type two stay two stray in terms of students' understanding of mathematical concepts. The population of this study were all students of class X SMA Negeri 1 Ketapang school year 2012/2013. The research sample is student of class X.1 as experiment class and X.3 grade students as the control classes by cluster random sampling technique. Based on these results, it was concluded that the use of two types of cooperative learning model stay two stray effective in terms of understanding mathematical concepts class X SMA Negeri 1 Ketapang school year 2012/2013.Keywords: effectiveness, two stay two stray, mathematical concepts]]>
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