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How Do You Put A Negative in Calculator

Reviewed by Calculator Editorial Team

Entering negative numbers in a calculator is a fundamental skill that's easy to master once you know the proper methods. Whether you're using a basic calculator or a scientific one, understanding how to input negatives correctly will help you perform calculations accurately.

Methods to Enter Negatives

There are several ways to input negative numbers depending on the type of calculator you're using. Here are the most common methods:

Using the Negative Sign Key

Most calculators have a dedicated negative sign key (often labeled with a minus symbol -). To enter a negative number:

  1. Press the negative sign key (-)
  2. Enter the number you want to make negative

For example, to enter -5, you would press - then 5.

Using Parentheses

Some calculators allow you to use parentheses to indicate negative numbers:

  1. Press the open parenthesis key (
  2. Press the negative sign key (-)
  3. Enter the number
  4. Press the close parenthesis key )

For example, to enter -5, you would press ( - 5 ).

Tip: Always double-check your calculations when using negative numbers to avoid sign errors.

Worked Examples

Let's look at some practical examples of how to enter negative numbers in different scenarios.

Example 1: Simple Subtraction

Calculate 10 - 15:

  1. Enter 10
  2. Press the subtraction key (-)
  3. Press the negative sign key (-)
  4. Enter 15
  5. Press the equals key (=)

The result should be -5.

Example 2: Scientific Notation

Enter -3.5 × 10-2:

  1. Press the negative sign key (-)
  2. Enter 3.5
  3. Press the multiplication key (×)
  4. Press the 10x key
  5. Press the negative sign key (-)
  6. Enter 2
  7. Press the equals key (=)

The result should be -0.035.

Frequently Asked Questions

Can I use the negative sign key for all calculations?
Yes, the negative sign key is the most straightforward method for entering negative numbers in most calculators. It's available on both basic and scientific models.
What if my calculator doesn't have a negative sign key?
If your calculator lacks a dedicated negative sign key, you can often use the subtraction key (-) at the beginning of a number to indicate a negative value. For example, pressing - then 5 will enter -5.
Are there any special considerations when using negative numbers?
Yes, when working with negative numbers, pay special attention to the order of operations and the signs of each number. Double-check your calculations to avoid sign errors.