Mathematics instruction would be more effective if students were able to help each other and exchange information actively. This can effectively be done when students are engaged in cooperative learning. The study was intended to analyse the extent to which mathematics education is supplemented with cooperative learning in Grade 9 of Secondary Schools in Alamata and Korem, Tigray. In order to address the research objectives, mixed methods design was employed. Questionnaires, interview and classroom observation were used to collect quantitative and qualitative data from a sample of 15 teachers and 322 students. The data was analysed using descriptive statistics. The results of the study revealed that the extent of practicing cooperative learning methods was not up to the expected level. The attitude of teachers toward using cooperative learning methods was favourable and yet, teachers' action in dealing with the basic components of cooperative learning was not promising. The findings showed that the major factors that inhibit the implementation of cooperative learning were lack of adequate training, lack of classroom facilities, lack of administrative support, lack of time, dependency of slow learners on more able learners, and traditional teaching methods. It is suggested that teachers should take basic training about the use and deliberation of cooperative learning as one of innovative teaching methods of mathematics education and as a means to realize their commitment.