This study aims to reveal the mathematics teachers' views about the 8th grade Mathematics Textbook (MTB) prepared according to the New Primary Education Mathematics Curriculum (NPEMC) which took effect in the 2005-2006 education period for the first time. The study uses a case study method. Convenience sampling was used in order to obtain more in-depth knowledge. The data we examine came from the semi structured interviews conducted with four mathematics teachers working in different primary schools in Trabzon province. The results of the study are that the teachers experienced distress in finding the necessary materials required for the activities in the textbook and the activities could not be implemented effectively in the over-populated classes. The study ends with the recommendations as the materials required for the activities in the textbooks should be easily accessible and the activities should be prepared considering the number of students in mathematics classes. [Paper presented at the World Conference on Educational Sciences (WCES) 2009.]