Home » Compound Numbers » Ninety nine or Ninety-nine?

# Ninety nine or Ninety-nine?

Ninety nine or ninety-nine?

In this article we show you how to write 99 in English words correctly.

In addition, we provide you with the grammar rule right away. 🙂

Regardless of where they appear in a number, hyphenate all compound numbers between 21 and 99 (not 30, 40, 50, 60, 70, 80, and 90) such as 99. In other words:

Hyphenate all numbers between twenty-one and ninety-nine, except those divisible by ten, even if the compound number is preceded or succeeded by numbers that do not require hyphens.
Thus, the correct spelling of 99 is ninety-nine (hyphenated).

Along the same lines:
• 99,000 = ninety-nine thousand (hyphenated).
• 99,000,000 = ninety-nine million (hyphenated).
• 99,000,000,000 = ninety-nine billion (hyphenated).

## Ninety-nine or Ninety nine Spelling

It doesn’t matter which noun follows the adjective, the grammar rule explained above remains in place.

In the examples below the correct spelling is underlined.

Ninety nine years or ninety-nine years?
Ninety nine percent or ninety-nine percent?
Ninety nine hours or ninety-nine hours?

### Does ninety nine have a hyphen?

Yes, 99 has a hyphen and is spelled correctly as ninety-nine.

### Do you hyphenate ninety nine?

Yes, you put a hyphen between ninety and nine: ninety-nine.

### Does ninety nine need a hyphen?

As 99 is a compound number in between 21 and 99 it needs a hyphen; therefore writing 99 in full is ninety-nine.

In the table below we show you the correct spelling of some numbers succeeding and precededing 99:
NumberName
94ninety-four
95ninety-five
96ninety-six
97ninety-seven
98ninety-eight
99ninety-nine
100one hundred
101one hundred one
102one hundred two
103one hundred three
104one hundred four

## Ninety ninth or Ninety-ninth?

In the following examples the correct spelling is underlined.

Ninety ninth part or ninety-ninth part?
Ninety ninth day or ninety-ninth day?
Ninety ninth hour or ninety-ninth hour?

• Does ninety ninth have a hyphen? Yes, the ordinal number for 99 has a hyphen and is spelled correctly as ninety-ninth.
• Do you hyphenate ninety ninth? Yes, you put a hyphen between ninety and ninth: ninety-ninth.
• Does ninety ninth need a hyphen? 99 is a compound number in between 21 and 99 which needs a hyphen. Thus, writing 99th in full is ninety-ninth.

## Ninety ninth or Ninety-nine?

As you already know, 99 as cardinal numeral is ninety-nine, and 99 as ordinal numeral is ninety-ninth.

Thus, the question in the subtitle above mixes two distinguished linguistic concepts and cannot be answered as such.

Observe that you can always check how to spell a number in full correctly using our converter below.

English:

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British

To:

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Letter case:

Sentence case
lowercase
UPPERCASE
Title Case
Spelling: Ninety-nine

## Summary

As explained by the hyphens-in-numbers rule, 99 = ninety-nine.

If you are happy with our information, then you may also be interested in our article twenty two or twenty-two.

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