A degree in mathematics is a type of academic qualification awarded to students who have completed a course of study in the field of mathematics. The term 'degree in mathematics' can refer to a variety of qualifications, including a Bachelor of Science (BSc), Master of Science (MSc) or Doctor of Philosophy (PhD). The answer to the crossword puzzle is 'NTH', which stands for 'numerical theory'. Numerical theory is a branch of mathematics that deals with the study of numerical algorithms and their applications.