Nowadays the new approaches that provide students active participation in learning-teaching process have emerged, as a consequence of understanding that the educational problems and traditional education can not be solved. One of these prominent approaches is cooperative learning method (Yilmaz, 2004). Cooperative learning is viewed as a tool for preparing students to work in teams as requred in various employment settings, in the home, and in the community when there is a need to combine energies and work towards a common goal (Bolling, 1994 from cited in Doymus, 2007). It is so important that this method, which allows the student's development with many aspects, are used especially in mathematics class ,in which makes students afraid. NCTM (1989) has published a report. The report shows that students ask questions each other, discuss their ideas, make mistake, learn to listen and make constructive criticism thanks to cooperative group work. It points out the role of learning mathematics because of paving the way for mathematical knowledge. Cooperative teaching method provide to students both
academic and social benefits (Gillies, 2002).