The aim of the research is to determine to what extent does cooperative learning could improve students achievement in the topic of fraction in mathematics, among year five students. In addition, the second aim of the study is to what extent does cooperative learning impressed student’s interest and motivation in learning the topic. Jigsaw structures cooperative learning is used in as the teaching learning approach. This study involves a sample of 60 students of year five from Primary School in the Subang Jaya, Selangor, who are categorised under middle and low achievers in mathematics. The study employed Quasi-Experimental, in which 30 students were exposed to cooperative learning (jigsaw) and the rest were exposed to traditional learning. Pre and post tests are used to determine the stage of improvement and achievement. A set of questionnaires were used to determine the interests and motivation of students towards cooperative learning. A set of statements in relation to the experience of being in the cooperative classroom were used to assess the perceptions of the students in learning. Data were analyzed by using SPSS Version 18. Research finding showed an increment scores mean achievement among the cooperative learners compared to the traditional learners. The study also showed that attitudes and positive motivation significantly related to cooperative learning. Hence, the perception of students from cooperative classroom are positive and they enjoyed studying fractions and believed that it was easy to understand. Finally, cooperative learning approach should be used as a platform to dominate the learning process in schools in order to build a world-class education level