Mathematics is a crucial part of everyone's life. One cannot do away by not studying mathematics. However, despite its importance, it is still considered the subject which is feared most in schools. Thus, it calls for immediate attention to look for causes which makes mathematics one of the most feared subject. One of the cause is learning difficulties in mathematics. Since, secondary level education is a stepping platform, thus learning difficulties at secondary level is an important topic of study. Learning difficulties not only reveal level and extent of student's knowledge about a concept, it also gives a framework to teachers to reflect upon their practices and act in consequence. Thus, this book makes an attempt to study learning difficulties in mathematics at secondary level and its plausible causes. I hope this book is equally helpful to parents, teachers and teacher educators.