Calculus is a branch of mathematics that focuses on the study of change and motion. It is used to solve problems in many fields, including physics, engineering, economics, and medicine. The three crossword solutions for the term CALCULUS CALCULATIONS are SLOPES (6 letters), INTEGRALS (9 letters), and AREAS (5 letters). Slopes refer to the rate of change between two points on a graph, integrals are used to calculate the area under a curve, and areas are used to calculate the size of a region.