Abstract: This study aimed at identifying the errors students commit when ordering, adding and subtracting fractions and the sources of these errors. This qualitative study employed a case study design with a sample size of 78 to help unravel students’ errors in fractions. Test and interview were the data collection instruments. Content analysis method was used to identify the errors students commit in fraction test while the interview data was analyzed thematically to ascertain the causes of the errors. It was found from the content analysis that, students committed both conceptual and procedural errors. The interview revealed that, lack of conceptual understanding, overgeneralization on the part of students and the manner in which student...