Basic Calculator

A basic calculator is a fundamental tool that performs the four primary arithmetic operations: addition, subtraction, multiplication, and division. While it may seem simple, understanding how to use a calculator efficiently and accurately is an essential skill for everyday math, from balancing budgets to cooking measurements and quick calculations.

The Four Basic Operations

• Addition (+): Combining two or more numbers to find their total sum. For example, 5 + 3 = 8.
• Subtraction (−): Finding the difference between two numbers by removing one quantity from another. For example, 10 − 4 = 6.
• Multiplication (×): Repeated addition of a number. For example, 6 × 4 = 24 (which is 6 + 6 + 6 + 6).
• Division (÷): Splitting a number into equal parts. For example, 20 ÷ 5 = 4 (meaning 20 divided into 5 equal groups gives 4 in each group).

Order of Operations

When performing multiple operations, the order matters! Follow PEMDAS (Parentheses, Exponents, Multiplication and Division from left to right, Addition and Subtraction from left to right):

• Parentheses first: Calculate anything in parentheses before other operations
• Multiplication and Division: Perform these before addition and subtraction, working from left to right
• Addition and Subtraction: Perform these last, working from left to right

For example: 5 + 3 × 2 = 5 + 6 = 11 (not 16!), because multiplication is done before addition.

Calculator Features

Most basic calculators include additional helpful features:

• Clear (C): Clears the current calculation and resets to zero
• Decimal point: Allows entry of decimal numbers for precise calculations
• Equals (=): Completes the calculation and displays the result
• Plus/Minus (+/−): Toggles between positive and negative numbers
• Percentage (%): Calculates percentages in various contexts