Problem Statement: In a teaching and learning environment, pupils' active participation with lessons as well as the use of learning approaches that help students remember what they learn are important dimensions. Effective learning approaches increase the quality of learning. Pupils learn best by doing and experiencing. To be effective and efficient, science teaching programs need to be pupil-centered and based on research and investigation, and should include experimental activities. In a cooperative learning approach, pupils and teachers are in a state of dynamic interaction in the classroom. When pupils interact in cooperative groups they learn to give and receive information, develop new understandings and perspectives, and communicate in a socially acceptable manner. This study investigates how a cooperative learning approach affects 7(th) grade primary school students' achievements and attitudes.