A variable is a letter that stands for a number that can change or is not yet known. It lets you write one expression that describes a whole family of situations.
Math Dictionary / Variable
Variable
A variable is a letter or symbol that represents a number or value.
AlgebraGrade 6Grade 7Grade 8Algebra 1GEDSATACT
What it means
Variables let us write rules and equations before we know the exact number.
Also called: unknown, symbol
Examples
| x + 4 = 10 |
| A = lw |
| y = 2x + 3 |
Common mistake
A variable does not always have to be x. Any letter or symbol can represent a value.
Try one
Question: In 3n + 2, what is the variable?
Show answer
The variable is n.