Mathematical expressions can be declared with a sequence of numbers and symbols. Evaluating a mathematical expression is the process of determining the value of an expression by applying standard rules for algebraic evaluation.
Evaluating arithmetic expressions can be done with pencil and paper or on a calculator, but most people use computers for these purposes because it is more efficient. In order to evaluate an expression, one must first understand what operations are being used in the expression, what numbers are being used, and how they relate to each other.
In mathematics, an arithmetic expression typically has two parts: operators (such as plus or minus), and operands (numbers that are used).