Introduction
What are variables?
- A variable represents a quantity that can change.
- A constant is a quantity that cannot change.
- Any symbol can be used as a variable.
- In computer science, variable quantities are often represented by words or abbreviations to help programmers understand the code.
- In mathematics, it is customary represent a variable quantity with a letter of the alphabet, like x or y.
Examples
Addition and subtraction
Q: Find the value of the variable:
9 + x = 12
A: Since 9 + 3 = 12, the value of x must be 3.
Multiplication and division
Q: Find the value of the variable:
4 × b = 20
A: Since 4 × 5 = 20, the value of b must be 5.
Practice | Variables
Click "Create Report" upon completion of any practice set to document your progress: Example