Sixty six or Sixty-six?

Sixty six or sixty-six?

In this article we show you how to write 66 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 66. 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 66 is sixty-six (hyphenated).

Along the same lines:

• 66,000 = sixty-six thousand (hyphenated).
• 66,000,000 = sixty-six million (hyphenated).
• 66,000,000,000 = sixty-six billion (hyphenated).

Sixty-six or Sixty six 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.

Sixty six years or sixty-six years?
Sixty six percent or sixty-six percent?
Sixty six hours or sixty-six hours?

Frequently Asked Questions about Sixty Six

Does sixty six have a hyphen?

Yes, 66 has a hyphen and is spelled correctly as sixty-six.

Do you hyphenate sixty six?

Yes, you put a hyphen between sixty and six: sixty-six.

Does sixty six need a hyphen?

As 66 is a compound number in between 21 and 99 it needs a hyphen; therefore writing 66 in full is sixty-six.

In the table below we show you the correct spelling of some numbers succeeding and precededing 66:

Sixty sixth or Sixty-sixth?

In the following examples the correct spelling is underlined.

Sixty sixth part or sixty-sixth part?
Sixty sixth day or sixty-sixth day?
Sixty sixth hour or sixty-sixth hour?

Frequently Asked Questions about Sixty sixth

• Does sixty sixth have a hyphen? Yes, the ordinal number for 66 has a hyphen and is spelled correctly as sixty-sixth.
• Do you hyphenate sixty sixth? Yes, you put a hyphen between sixty and sixth: sixty-sixth.
• Does sixty sixth need a hyphen? 66 is a compound number in between 21 and 99 which needs a hyphen. Thus, writing 66th in full is sixty-sixth.

Sixty sixth or Sixty-six?

As you already know, 66 as cardinal numeral is sixty-six, and 66 as ordinal numeral is sixty-sixth.

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.

Number:

English:

American
British

To:

Words
Check
Currency

Letter case:

Sentence case
lowercase
UPPERCASE
Title Case

Reset

Spelling: Sixty-six

Summary

As explained by the hyphens-in-numbers rule, 66 = sixty-six.

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


We love to hear your feedback and answer any question about how to correctly write 66 you might have.

Thanks for visiting howdoyouspell.org.

– Article written by Mark, last updated on May 5th, 2023