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How to Put Minus on A Calculator

Reviewed by Calculator Editorial Team

Using the minus sign on a calculator is a fundamental operation that appears in almost every calculation. Whether you're doing basic arithmetic, solving equations, or working with negative numbers, understanding how to properly use the minus sign is essential.

Basic Calculator Minus Usage

The minus sign (-) is used to indicate subtraction or to represent negative numbers on most calculators. Here's how to use it properly:

Subtraction

To subtract one number from another, simply press the first number, then the minus sign, then the second number, and finally the equals sign. For example, to calculate 5 minus 3:

  1. Press the number 5
  2. Press the minus (-) sign
  3. Press the number 3
  4. Press the equals (=) sign

The calculator will display the result: 2.

Negative Numbers

To enter a negative number, press the minus sign before entering the number. For example, to enter -7:

  1. Press the minus (-) sign
  2. Press the number 7

The calculator will display: -7.

Formula: For any calculation involving subtraction or negative numbers, the minus sign must be placed before the number you want to subtract or make negative.

Scientific Calculators

Scientific calculators offer more advanced functions and often have different layouts for the minus sign. Here's how to use it on scientific calculators:

Basic Operations

The process is similar to basic calculators:

  1. Enter the first number
  2. Press the minus (-) sign
  3. Enter the second number
  4. Press the equals (=) sign

Negative Numbers in Functions

When using functions like square roots or logarithms, you can enter negative numbers by pressing the minus sign before the number:

  1. Press the function key (e.g., √ for square root)
  2. Press the minus (-) sign
  3. Enter the number
  4. Press the closing parenthesis if needed
  5. Press the equals (=) sign

Note: Some scientific calculators may require you to use parentheses when working with negative numbers in functions.

Programmable Calculators

Programmable calculators allow you to write custom programs and use the minus sign in various ways:

Basic Usage

The minus sign works the same as in basic calculators for simple operations.

In Programs

When writing programs, you can use the minus sign to:

  • Perform subtraction operations
  • Assign negative values to variables
  • Use in conditional statements (e.g., IF X < 0 THEN...)

Example: To subtract 5 from a variable X and store the result in Y, you would write: Y = X - 5

Common Mistakes

When using the minus sign on a calculator, there are several common mistakes to avoid:

1. Forgetting the Minus Sign

One of the most common mistakes is simply forgetting to press the minus sign when you need to subtract or enter a negative number. Always double-check that you've pressed the correct sign.

2. Misplacing the Minus Sign

Another common mistake is placing the minus sign in the wrong position. For example, entering 5 - 3 as 53 - instead of 5 - 3. This will result in incorrect calculations.

3. Confusing Minus with Subtract

Some calculators may have separate keys for minus (-) and subtract (often the same key). Make sure you're pressing the correct key for your operation.

4. Ignoring Parentheses

When working with negative numbers in functions or complex expressions, it's easy to forget to include parentheses. Always ensure proper parentheses placement for accurate results.

Tip: Practice entering simple calculations with negative numbers to become more familiar with the proper placement of the minus sign.

Examples

Here are some practical examples of using the minus sign on a calculator:

Example 1: Basic Subtraction

Calculate 10 minus 4:

  1. Press 1, then 0
  2. Press the minus (-) sign
  3. Press 4
  4. Press the equals (=) sign

Result: 6

Example 2: Negative Number

Enter the negative number -8:

  1. Press the minus (-) sign
  2. Press 8

Result: -8

Example 3: Complex Expression

Calculate 5 times (negative 3 plus 2):

  1. Press 5
  2. Press the multiplication (×) sign
  3. Press the opening parenthesis (
  4. Press the minus (-) sign
  5. Press 3
  6. Press the plus (+) sign
  7. Press 2
  8. Press the closing parenthesis )
  9. Press the equals (=) sign

Result: -5

Formula: For complex expressions, always ensure proper parentheses placement to maintain the correct order of operations.

FAQ

Can I use the minus sign for both subtraction and negative numbers?
Yes, the minus sign serves both purposes. It's used for subtraction operations and to indicate negative numbers.
What if I accidentally press the minus sign twice?
Pressing the minus sign twice will typically result in a negative number with two minus signs, which is equivalent to a positive number. For example, --5 is the same as 5.
Can I use the minus sign with decimal numbers?
Yes, you can use the minus sign with decimal numbers just like with whole numbers. For example, -3.14 is a valid negative decimal number.
Is there a difference between the minus sign and the subtract key?
On most calculators, the minus sign and subtract key are the same. However, some scientific calculators may have separate keys for these operations.
What should I do if my calculator doesn't have a minus sign?
If your calculator doesn't have a minus sign, check if it has a subtract key or if you need to use a different input method for negative numbers.