‘Ninty’ or ‘Ninety’: How to Spell the Number ‘90’ Correctly

By Shanea Patterson, updated on November 18, 2022

Need to spell out ‘90’ but not sure how to spell it? Is it 'ninty' or 'ninety'? We’ll tackle that below, plus teach you how to use the word in a sentence correctly.

The correct answer is that ‘90’ is spelled out as ‘ninety.’ Any other spelling of the word is incorrect and ungrammatical. 

Ninty vs. Ninety: Which is the Correct Spelling of 90?

So, which is the correct spelling of ‘90’? As you just learned, the correct spelling of the number ‘90’ is ‘ninety.’ Spelling ‘ninty’ would be incorrect.

Ninety vs. Ninty – What’s the Difference?

The difference between ‘ninety’ and ‘ninty’ is that the former is correct and the latter incorrect. Never use the latter when writing out the word.

Definition and Meaning

The definition of ‘ninety’ is: “a number equal to nine times 10,” and “the numbers 90 to 99,” according to Merriam-Webster.

The Cambridge definition of the word is: “the number 90.”

Understanding How to Write Out Numbers

Writing numbers in word form can be tricky for some people, even native English speakers.

Here’s how you’d write out your numbers from one to twenty.

  • One
  • Two
  • Three
  • Four
  • Five
  • Six
  • Seven
  • Eight
  • Nine
  • Ten
  • Eleven
  • Twelve
  • Thirteen
  • Fourteen
  • Fifteen
  • Sixteen
  • Seventeen
  • Eighteen
  • Nineteen
  • Twenty

The rest of the numbers up to 100 generally repeat. For example:

  • Twenty-one
  • Thirty-two
  • Forty-three
  • Fifty-four
  • Sixty-five
  • Seventy-six
  • Eighty-seven
  • Ninety-eight

There would be no more new numbers to remember how to spell. You get the idea.

Other Confusing Words

The English language contains lots of words that people often find hard to spell.


Restaurateur is a word people often spell wrong, thinking there’s an ‘n’ in the word because restaurant contains that letter. But there’s actually no ‘n’ in the word at all.


Joiner is a word a lot of people get confused about when it comes to spelling. A lot of people think the correct word to use is ‘joinee,’ but that’s actually incorrect.


Column is another tricky word to spell for a lot of people because the ‘n’ is silent.

How to Use ‘Ninety’ in a Sentence Correctly 

Now that you understand how to write out numbers in word form, we can talk about how to use the word in a sentence.

Take a look at a few examples of how to use the word in a sentence.

  • My grandpa is turning ninety; I got him a balloon, a card, and a piece of cake.
  • This holiday will mark 90 years our parents have been celebrating.
  • I feel like I’m 90. I’m so tired; let’s get a margarita.
  • They’re going to cut down 90 trees in that forest behind our house tomorrow.

It’s also helpful to know that when writing in AP style, numbers from 0 to 10 should always be spelled out. Once they get past 10, you should write them in numerical form. However, when one number is below ten, and the other is above ten, you’d use either one or the other (numerical or word form). Usually, whichever number came first, you’d just follow the rule for that number (and the other number would have to conform).

Final Thoughts on ‘Ninty’ and ‘Ninety’

Spelling out numbers means knowing how to spell them correctly, and now that you know how to spell out a few numbers, you should have no trouble doing it on your own.

Use the above examples as a guide and come back whenever you need to. Our library of articles dedicated to explaining confusing words and phrases is for people learning English for the first time or just brushing up on the English they already know.

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Written By:
Shanea Patterson
Shanea Patterson is a writer based in New York and loves writing for brands big and small. She has a master's degree in professional writing from New York University and a bachelor's degree in English from Mercy College.

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