With the confirmation of the coronavirus epidemic as a global pandemic, and with the suspension of face-to-face teaching and learning activities for all educational institutions, the concept of emergency remote teaching has come into prominence. As a process that affects a large number of students, the effective management of emergency remote teaching process has important effects on ensuring the sustainability of learning and students' well-being. It becomes an important issue to examine teachers' evaluations about their emergency remote teaching experiences. The purpose of this study was to examine the evaluations of mathematics teachers' emergency remote teaching experiences. The case study method was used and the participants consisted of 10 middle school mathematics teachers. The data were collected by semi-structured interviews. In the data analysis process content analysis method was used. As a result, it was seen that participating teachers' current understanding of the concept of distance education has influenced the way they conduct their online lessons. It was revealed that participating teachers carried out emergency remote teaching period in ways that they could transfer the face-to-face learning environment to online environment. Again, it was seen that mathematics teachers pointed to their lack of knowledge and skill about online learning.