Middle school is a significant period in students' mathematical development, a period in which they crystallize their understanding of mathematical concepts and procedures and make the unconscious decision as to whether they will be successful in math. The project is intended to be an instructional resource providing teachers of middle school mathematics with information about common mathematical misconceptions held by students. The data for this research is taken from actual student work on the applied skills sections of the 2002 6th and 8th grade ISTEP+ Mathematics Assessments. The misconceptions are categorized according to specific standards as defined by NCTM, and corresponding Indiana Academic Standards are identified.