A calculator could be a device that performs arithmetic operations on numbers. An electronic calculator is usually a portable electronic device used to perform calculations, ranging from basic arithmetic to complex mathematics. The simplest calculators will do only addition, subtraction, multiplication, and division. A lot of refined calculators will handle exponential operations, roots, logarithms, trigonometric functions, and hyperbolic functions. Internally, some calculators actually perform all of those functions by repeated processes of addition.