This study investigated experiences of primary school teachers with inclusion students in the context of teaching mathematics. In the study the phenomenology design, which is one of the qualitative research designs, was used. The participants were determined by criterion-based sampling method. The participants of the study consisted of 21 primary school teachers with inclusion students. Research data were collected by a semi-structured interview form developed by the researchers. Content analysis method was used for data analysis. The study found that the participants mostly used rough evaluation forms in order to determine the gains when preparing IEP. In addition, most of the participants stated that they needed help in preparing IEP and they received the most of the help from school counselors. The participants stated that they mostly used demonstration, teaching with play and drama methods and that they could practice with inclusion students only during breaks, during social activities times or in the hours in the support training room apart from mathematic class. Moreover, it was found that most of the participants measured verbally gains of the inclusion students by question and answer method. It was also concluded that inadequacy of the time was the most common problem they encountered in the process of learning-teaching and assessment for the mathematics class.