Numeral (dozen, hundred, thousand, million) without a determiner or a number

Words such as dozen, hundred, thousand and million usually need a determiner (a, an, the) or a numeral. Bare forms like "dozen flowers" or "hundred dollars" sound unfinished in standard written English and can confuse readers.

Use a/an for one group (a dozen), a numeral for an exact amount (100, 1,000), or plural + of for an indefinite many (dozens of, hundreds of).

Quick answer

Put a determiner or a number before dozen, hundred, thousand, million - or use the plural + of when you mean "many."

One group: a/an + noun - a dozen, a hundred, a thousand.
Exact amount: numeral - 12 dozen, 100, 1,000.
Indefinite many: plural + of - dozens of, hundreds of, thousands of.

Core grammar: why these words need a determiner or number

Dozen, hundred, thousand, million behave like count nouns that mark quantity. English count nouns normally require an article, determiner, or numeral. A bare form often sounds clipped or ungrammatical in writing.

If you mean "many" without specifying, use the plural + of. If you mean one unit, use a/an; if you mean a precise figure, use digits.

Wrong: I bought dozen eggs this morning.
Right: I bought a dozen eggs this morning.
Wrong: They raised million dollars in funding.
Right: They raised a million dollars in funding.

Common wrong/right pairs (quick scan)

Swap a bare numeral word for a/an, a number, or plural + of depending on meaning.

Wrong: I saw dozen flowers at the park.
Right: I saw a dozen flowers at the park.
Wrong: She needs hundred dollars to buy a new phone.
Right: She needs a hundred dollars to buy a new phone.
Wrong: There are dozen of reasons to try it.
Right: There are dozens of reasons to try it.
Wrong: He earned thousand pounds last year.
Right: He earned a thousand pounds last year.
Wrong: Students read hundred pages for homework.
Right: Students read one hundred pages for homework.
Wrong: We expect million users next quarter.
Right: We expect one million users next quarter.

Work examples: reports, budgets and emails

Business writing favors clarity. Use numerals for precise figures in tables and determiners or numbers in prose.

Wrong: The campaign cost million dollars.
Right: The campaign cost a million dollars.
Wrong: We hired hundred new employees last quarter.
Right: We hired one hundred new employees last quarter.
Wrong: I'll send hundred invoices by Friday.
Right: I'll send a hundred invoices by Friday.
Right (financial): The project requires $1,250,000 in funding.Right (narrative): The project requires about a million dollars.

School examples: essays, lab reports and assignments

Teachers expect determiners or numerals. Use digits in tables, words with determiners in running text.

Wrong: The experiment ran thousand trials.
Right: The experiment ran a thousand trials.
Wrong: She copied dozen sentences from the source.
Right: She copied a dozen sentences from the source.
Wrong: The book contains hundred examples.
Right: The book contains one hundred examples.

Casual examples: texts, posts and captions

Spoken language sometimes drops small words, but written posts look cleaner with full forms.

Wrong: Got dozen pics from the weekend.
Right: Got a dozen pics from the weekend.
Wrong: There's hundred reasons I love this song.
Right: There are hundreds of reasons I love this song.
Wrong: Bought thousand stickers for the laptop.
Right: Bought a thousand stickers for the laptop.Informal alternative: Bought a ton of stickers.

Try your own sentence

Test the whole sentence, not just the phrase. Context usually makes whether to add a/an, one, or of obvious.

Rewrite help: fix any sentence in three steps

Checklist: 1) Is the numeral word bare? 2) Do you mean one group or many? 3) Replace with a/an, numeral, or plural + of.

Copyable templates: a dozen + noun; one hundred + noun; dozens of + plural noun; about + numeral + noun.

Rewrite:
Wrong: Dozen people signed up.
Rewrite: About a dozen people signed up.
Rewrite:
Wrong: Hundred students passed the exam.
Rewrite: One hundred students passed the exam.
Rewrite:
Wrong: We saw thousand stars.
Rewrite: We saw a thousand stars. (Or: We saw thousands of stars.)
Rewrite:
Wrong: Company expects million in revenue.
Rewrite: The company expects $1,000,000 in revenue. (Or: a million dollars in revenue.)

Hyphenation and spacing (plus number formatting)

When a number phrase modifies a noun, hyphenate: a hundred-dollar prize, a 100-year-old building. If the amount follows the noun, do not hyphenate: The prize is a hundred dollars.

Write large numbers with commas in most styles: 1,000; 100,000; 1,000,000. No extra spaces inside numerals.

Wrong: She won hundred dollar prize.
Right: She won a hundred-dollar prize.
Wrong: The building is 100 year old.
Right: The building is a 100-year-old building.
Wrong: The grant was 1000000 dollars.
Right: The grant was $1,000,000.

Memory tricks and similar mistakes

Read sentences aloud and listen for a missing small word - usually a or one. If it sounds clipped, add the article or a number.

Common sibling errors: forgetting of after plural forms (dozens people → dozens of people) and mixing adjective forms (hundred dollars vs hundred-dollar).

If you mean many but not exact → use dozens of / hundreds of.
If the phrase modifies a noun → hyphenate (a ten-thousand-dollar contract).
If writing precise figures → use numerals with commas (10,000).
Wrong: Dozens people arrived early.
Right: Dozens of people arrived early.
Wrong: She bought hundred-pound weight.
Right: She bought a hundred-pound weight.
Note: 'Score' behaves like 'dozen' - prefer a score of or a numeral in modern usage.

FAQ

Can I say 'dozen' without 'a'?

No. Use 'a dozen' for twelve, or 'dozens of' for an unspecified many. Bare 'dozen' is generally incorrect in standard writing.

Is 'hundreds people' correct?

No. Use 'hundreds of people' for an indefinite many. For an exact amount use '100 people' or 'one hundred people.'

When to write 'a thousand' vs '1,000'?

Use digits for tables, data, and finance; use words with determiners in narrative prose. Follow your style guide for consistency.

Do I need hyphens in 'a hundred dollar bill'?

Yes, when the phrase modifies a noun: a hundred-dollar bill. When the amount follows the noun no hyphen is needed: The bill is a hundred dollars.

Quick fix: I see 'dozen' or 'hundred' alone - what should I do?

Ask: Do you mean one group? Add 'a' or 'one'. Do you mean many? Use 'dozens of' or 'hundreds of'. Do you mean a precise figure? Use numerals and commas.

Want to check a sentence now?

Paste a sentence into a grammar checker to see whether it recommends adding a determiner, a number, or changing to plural + of. A tool that explains the correction helps you learn the pattern faster than fixing one sentence at a time.

Regularly practicing the three templates-'a dozen', 'one hundred', 'dozens of'-makes this rule automatic in your writing.