In recent years, the rapid development of educational technologies has encouraged the adoption of innovative approaches in teaching processes. Mathematics education is of critical importance in terms of developing analytical thinking and problem-solving skills. In this context, the integration of Web 2.0 tools into teaching processes can increase students' interest in mathematics lessons and make learning processes more effective. The aim of the research is to examine the perceptions of primary school teachers regarding the use of Web 2.0 tools in mathematics lessons. In the study conducted with the qualitative research method, data were collected from 80 teachers working in 6 different schools. The data were obtained through semi-structured interviews and evaluated with the descriptive analysis method. The findings show that teachers find Web 2.0 tools more useful in terms of enriched teaching, permanent learning and student motivation. In addition, it was determined that the frequency of use of Web 2.0 tools decreased as the years of seniority increased. This research makes significant contributions to understanding teachers' adaptation to technology and the role of Web 2.0 tools in education.