Basic Operations Calculator
A simple calculator for addition, subtraction, multiplication, and division
Result
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What You Need to Know
This calculator does addition, subtraction, multiplication, and division. If you're doing complex expressions with multiple operations, remember PEMDAS (order of operations): Parentheses first, then Exponents, then Multiplication/Division (left to right), then Addition/Subtraction (left to right).
So 3 + 4 × 5 = 23 (multiply first, then add), but (3 + 4) × 5 = 35 (parentheses force the addition first).
With negative numbers: adding a negative is like subtracting, subtracting a negative is like adding, and multiplying/dividing two negatives gives a positive.
FAQ
What is the order of operations?
PEMDAS: Parentheses, Exponents, Multiplication/Division (left to right), Addition/Subtraction (left to right). Do things in that order or you'll get the wrong answer.
What happens if I divide by zero?
You can't. Division by zero is undefined—it breaks math. Most calculators will show an error.
How do I handle negative numbers?
Adding a negative is subtraction (5 + (-3) = 2). Subtracting a negative is addition (5 - (-3) = 8). Multiplying/dividing two negatives = positive. Multiplying/dividing a positive and negative = negative.
What's the difference between whole numbers and integers?
Whole numbers are 0, 1, 2, 3, etc. (no negatives). Integers include negatives too: ..., -2, -1, 0, 1, 2, .... Both work the same in calculations.