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How to Put A Negative Number in Calculator

Reviewed by Calculator Editorial Team

Negative numbers are essential in many calculations, from finance to physics. This guide explains how to properly enter and work with negative numbers in different types of calculators.

How to Enter Negative Numbers

Entering negative numbers varies slightly depending on your calculator type. Here are the most common methods:

Basic Calculator Method

  1. Press the negative sign (-) button
  2. Enter the number you want to make negative
  3. Press the equals (=) button to display the result

Scientific Calculator Method

  1. Press the negative sign (-) button
  2. Enter the number
  3. Press the exponent (^) button and enter 1 to confirm

Graphing Calculator Method

  1. Press the negative sign (-) button
  2. Enter the number
  3. Press the close parenthesis ) button to complete the entry

For touchscreen calculators, simply tap the negative sign before entering the number.

Tip: Many calculators have a "negative" or "±" button that toggles the sign of the current number. This can be quicker than pressing the negative sign each time.

Different Calculator Types

Different calculator types handle negative numbers in slightly different ways:

Calculator Type Negative Number Entry Special Features
Basic Calculator Press - then number Simple arithmetic operations
Scientific Calculator Press - then number Exponents, logarithms, trigonometry
Graphing Calculator Press - then number Graphing functions, equations
Programmable Calculator Press - then number Custom programs, memory functions
Financial Calculator Press - then number Interest calculations, NPV, IRR

Most modern calculators follow the same basic pattern for entering negative numbers, though some may have additional features for working with negative values.

Common Mistakes

When working with negative numbers, these common mistakes can lead to incorrect results:

  • Forgetting to press the negative sign before entering the number
  • Accidentally pressing the subtraction button instead of the negative sign
  • Not closing parentheses properly in graphing calculators
  • Misplacing decimal points in negative numbers
  • Assuming the calculator will automatically handle negative results

Remember: Negative numbers require explicit entry. The calculator won't assume you want a negative result unless you tell it to.

Worked Examples

Let's look at some practical examples of entering and working with negative numbers:

Example 1: Basic Subtraction

Calculate 5 - 10:

  1. Press 5
  2. Press - (subtraction)
  3. Press - (negative sign)
  4. Press 1
  5. Press 0
  6. Press =

Result: -5

Example 2: Scientific Calculation

Calculate -3 squared:

  1. Press -
  2. Press 3
  3. Press ^ (exponent)
  4. Press 2
  5. Press =

Result: 9 (since (-3)² = 9)

Example 3: Financial Calculation

Calculate the difference between -$200 and -$300:

  1. Press -
  2. Press 2
  3. Press 0
  4. Press 0
  5. Press - (subtraction)
  6. Press -
  7. Press 3
  8. Press 0
  9. Press 0
  10. Press =

Result: 100 (since -200 - (-300) = 100)

FAQ

Can I enter negative numbers in all calculators?

Yes, all standard calculators support negative numbers. The method may vary slightly between calculator types, but the basic principle remains the same.

What happens if I forget to press the negative sign?

The calculator will treat the number as positive. For example, entering "5 - 10" without the negative sign would result in 15 instead of -5.

Can I use negative numbers in scientific functions?

Yes, scientific calculators handle negative numbers in all functions including exponents, logarithms, and trigonometric functions.

How do I clear a negative number from the calculator?

Press the clear (C) or all clear (AC) button to remove the negative number. Some calculators may require pressing the negative sign twice to toggle back to positive.