In Turkey the student-centered education has been implemented since 2004-2005 academic year. Primary school teachers have a crucial role for the succession of new math curricula. In this study a CBMT material prepared and applied to get better understanding. When the researcher faced with any mistakes, to investigate whether there is misconception or not, student’s writings, graphics drew on computer screen investigated and clinical interviews are made. During the implementation, two misconceptions concerning a point in the coordinate axis were determined. One of them is thinking two points such (x, 0) and (0, y) as a point (x, y).