# Numbers and units of measureΒΆ

When using numbers in running text, follow these guidelines:

Spell out numbers from one to nine. However, use numerals for units of measure.

Use Arabic numerals for numbers above ten.

If a numeral starts a sentence, spell it out. For example:

*Five thousand environments have been deployed during the last six months.*In one sentence, use either a spelled-out number or a numeral, not both.

Use a comma if a numeral includes more than 4 digits. For example:

*50,000*.

In mathematical expressions:

Use the

*x*symbol for multiplication.Add a space between numbers and operators. For example:

*256 x 2 = 512*.

When using units of measure in running text, follow these guidelines:

Use the corresponding unit symbol if a unit of measure comes immediately after a numeral.

**Kb**for kilobit**KB**for kilobyte**kbps**for kilobits per second**GB**for gigabyte**Gbit**for gigabit**MB**for megabyte

Do not pluralize an abbreviated unit of measure.

Add a space between a numeral and a unit of measure.

This documentation, is a derivative of Writing style by OpenStack, used under CC BY.