Writing Expressions

Subtraction is the operation of finding the difference between two numbers. It is represented by the minus sign (-). For example, in the expression 25 - 5, 5 is subtracted from 25.

v - 5

Total is NOT a keyword for multiplication. Keywords for multiplication include double, product, and times.

20/n

2c + 20

An algebraic expression is a mathematical phrase that can include numbers, variables, and operation symbols. For example, 3x + 5 is an algebraic expression.

A variable represents an unknown value in an algebraic expression. It is usually denoted by letters such as x, y, or n.

Twice a number can be expressed as 2n, where n is the variable representing the unknown number.

An expression is a combination of numbers, variables, and operations without an equality sign, while an equation states that two expressions are equal, indicated by an equality sign (=).

x + 10