Basic Calculator

Free online basic calculator for addition, subtraction, multiplication, and division. Simple, fast, and easy to use.

Online Calculator
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How to Use This Calculator

This basic calculator performs simple arithmetic operations: addition, subtraction, multiplication, and division.

Buttons:

  • 0-9: Number buttons to input digits.
  • + − × ÷: Operation buttons for arithmetic.
  • =: Calculate the result.
  • AC: All Clear - resets the calculator.
  • : Backspace - deletes the last digit.
  • ( ): Parentheses for grouping operations.
  • .: Decimal point for decimal numbers.

This calculator follows standard order of operations (PEMDAS/BODMAS).

Order of Operations (PEMDAS)

When calculating expressions with multiple operations, the order matters. This calculator follows the standard mathematical order of operations:

  1. Parentheses: Calculate expressions inside parentheses first.
  2. Exponents: Calculate powers and roots next.
  3. Multiplication and Division: From left to right.
  4. Addition and Subtraction: From left to right.
💡 Example: 2 + 3 × 4 = 14 (NOT 20)
Because multiplication is done before addition: 3 × 4 = 12, then 2 + 12 = 14.

Basic Arithmetic Operations

OperationSymbolExampleResult
Addition+5 + 38
Subtraction−10 - 46
Multiplication×6 × 742
Division÷20 45

History of Calculators

The first mechanical calculator was invented by Blaise Pascal in 1642, called the Pascaline. It could only add and subtract. In 1673, Gottfried Wilhelm Leibniz built a calculator that could also multiply and divide.

The first electronic calculator was developed in the 1960s. By the 1970s, handheld calculators became widely available, revolutionizing mathematics education and business.

Tips for Using Calculators Effectively

  • Double-check your input: Always verify numbers before pressing equals.
  • Use parentheses: When in doubt about order of operations, use parentheses to clarify.
  • Estimate first: Do a rough mental calculation to verify the calculator's result is reasonable.
  • Understand limitations: Calculators have precision limits with very large or very small numbers.

References

  • Smithsonian Institution. "History of Calculators." 2024.
  • Khan Academy. "Order of Operations." 2024.