Basic Calculator
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How This Calculator Works
This is a standard four-function calculator: it performs addition, subtraction, multiplication, and division on two numbers using ordinary arithmetic, the same operations you'd do by hand or with a physical desktop calculator. Enter two numbers and choose an operation above, or use the on-screen keypad to build and evaluate an expression one keystroke at a time, just like a real calculator. Division by zero is undefined in arithmetic, so the calculator flags it as an error rather than returning a number.
Order of Operations on the Keypad
The keypad evaluates left to right as you press operator keys, updating a running total each time — pressing 6, +, 2, ×, 3 computes (6 + 2) × 3 = 24, not 6 + (2 × 3), which is how most simple calculators behave (as opposed to scientific calculators, which respect full algebraic precedence). If you need parentheses, exponents, roots, or trigonometric and logarithmic functions evaluated in proper mathematical order, use the scientific calculator instead.
Beyond the Four Basic Operations
Everyday arithmetic often needs more than +, −, ×, and ÷. If your numbers are fractions rather than decimals, the fraction calculator keeps them exact instead of rounding. For quick percentage math — discounts, tips, percent change — the percentage calculator is purpose-built for that instead of requiring you to convert manually.
Frequently Asked Questions
Why does the keypad give a different answer than typing the same numbers into a scientific calculator?
This calculator evaluates operations strictly left to right as you press keys, the way a simple everyday calculator works, rather than following full algebraic order of operations (multiplication/division before addition/subtraction). For example, 6 + 2 x 3 on this keypad computes (6 + 2) x 3 = 24. If you need standard mathematical precedence and parentheses, use the scientific calculator instead.
What happens if I divide by zero?
Division by zero is undefined in mathematics, so the calculator returns an explicit error message rather than a numeric result, both in the two-number form and on the keypad.