In mathematics, an expression or mathematical expression is a finite combination of symbols that is well-formed according to rules that depend on the context). An expression in math is a statement having a minimum of two numbers, variables, or both, and an operator connecting them. An expression is a combination of terms that are combined using mathematical operations such as subtraction, addition, multiplication, and division. An expression or algebraic expression is any mathematical statement that consists of numbers, variables, and an arithmetic operation between them. An expression is a set of numbers or variables combined using the operations $+$, $–$, $\times$ or $\div$ .

Some key points to note about expressions in math are:

• An expression is a syntactic construct that must be well-formed according to the rules of syntax).
• An expression can be used to designate a value, which might depend on values assigned to variables occurring in the expression).
• An expression can be evaluated to true or false, depending on the values that are given to the variables occurring in the expressions).
• An expression can be used to solve complicated puzzles.
• An expression can be formed using a combination of different variables and numbers.
• An expression does not have an equals sign.

Examples of expressions include $7 + 9$, $23.5 \times 4$, $37\text{s} – 6\text{t}$, $25\text{a}^4 + 9 – 4 ÷ 15$, $2y-9$, $3a×2$, $-7+6÷3$, and $4m + 5$ .