# Number

A **number** may refer to any of the following:

1. Sometimes abbreviated as **num**, a **number** is any character that's 1, 2, 3, 4, 5, 6, 7, 8, 9, or 0. Any **negative number** is any earlier characters beginning with a hyphen; for example, "-12" is a negative number. Numbers have many relationships with computers. Examples include measuring the clock speed of a CPU (Central Processing Unit) or the binary numbers that send the CPU instructions.

A number with a minus (hyphen) in front of it is known as a negative number and not a minus number.

## How to type numbers

On the computer keyboard, you can use the numbers on the number keys row at the top of the keyboard if you're typing letters and numbers. If you need help determining what finger to use for each letter, see the link below. If you're only typing numbers or doing a calculation and it's available, use the numeric keypad.

When using the numeric keypad, you may need to press the Num Lock key to enable the numbers if they are not working.

## How to perform arithmetic with numbers?

With a computer, the user can perform arithmetic using a calculator, programming language, or spreadsheet.

## Number pages

The following links are the number pages on Computer Hope that contain further information about each number.

2. The term number also refers to an **ordered list** or **number list**. See our numbering definition for information about creating this type of list.

3. **Number** is cell format available in Microsoft Excel with the ability adding comma separators and adjusting the decimal place.

Use the keyboard shortcut `Ctrl`+`Shift`+`1` to change a cell format to number.

4. A **number** is an abbreviation used for "phone number."

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