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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com
they number three
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase "they number three" is correct and usable in written English.
It can be used when indicating the quantity of a group or items, often in a formal or literary context. Example: "In the box, they number three, each one representing a different aspect of the project."
✓ Grammatically correct
News & Media
Encyclopedias
Science
Alternative expressions(3)
Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Human-verified examples from authoritative sources
Exact Expressions
1 human-written examples
As usual, there are catalysts for this column; in this case they number three.
News & Media
Human-verified similar examples from authoritative sources
Similar Expressions
59 human-written examples
They number forty or so, in a rough hierarchy, with Captain Henry (Domhnall Gleeson) just about keeping charge.
News & Media
They number five, one for each operation in the six years Baker spent away from professional tennis.
News & Media
The beast is not made human by his beauties, whether they number eight, nine, or hundreds; he just becomes more of a beast.
News & Media
One text, the Varaha-purana, states that they number eight, including Yogeshvari, created out of the flame from Shiva's mouth.
Encyclopedias
John Doran's acclaimed memoir Jolly Lad, based on his long-running column MENK for VICE is available from STheyge Attractor Presse Attractor Press.
News & Media
Since 1991 they number five: White ("branca"), Brown ("parda"), Black ("preta"), Yellow (amarela) and Indigenous ("indígena").
Science
When warriors from the famous Chinese terra cotta army buried with Emperor Qin Shi Huang (259-210 Bcameame to the Los Angeles County Museum of Art in 1987, they numbered three.
News & Media
He said they numbered six -- Chaplin, W. C. Fields, Buster Keaton, Groucho and Harpo Marx, and Peter Sellers -- not just Chaplin and Fields.
News & Media
They numbered fourteen men, and were headed by one Allighan Kangany, who had followed Mr. Hill, his former master, from Ceylon.
Academia
They numbered six each, in 1810 increased to ten each.
Wiki
Expert writing Tips
Best practice
Use "they number three" in formal writing or when aiming for a slightly elevated tone. In everyday conversation, consider using simpler alternatives like "there are three of them".
Common error
Avoid using "they number three" in informal contexts or when speaking. This phrase is better suited for written communication where a more formal tone is desired.
Source & Trust
83%
Authority and reliability
3.9/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "they number three" functions as a declarative statement expressing quantity. It uses "they" as a pronoun referring to a group and "number" as a verb indicating the count. As Ludwig points out, the phrase is grammatically correct.
Frequent in
News & Media
30%
Encyclopedias
20%
Science
15%
Less common in
Academia
10%
Formal & Business
10%
Wiki
5%
Ludwig's WRAP-UP
In summary, the phrase "they number three" is a grammatically correct, albeit somewhat formal, way to express that a group consists of three individuals or items. As indicated by Ludwig, this phrase is best suited for written communication, particularly in contexts such as News & Media, Encyclopedias and scientific writing where a more elevated tone is desired. While the phrase is not incorrect, simpler and more common alternatives like "there are three of them" are often preferred in everyday speech. Its relatively low frequency suggests that while usable, it might not be the first choice for many writers seeking clarity and directness.
More alternative expressions(10)
Phrases that express similar concepts, ordered by semantic similarity:
there are three of them
Uses a more common and direct construction with "there are".
the total is three
Focuses on the sum or aggregate, rather than the individuals.
they amount to three
Emphasizes the final quantity after a process of accumulation.
they constitute three
Highlights their role in forming a larger whole.
their count is three
Uses a noun form to express the quantity.
they tally three
Implies a formal counting or calculation process.
they sum up to three
Similar to "they amount to three", but more colloquial.
a trio of them exists
Employs a more literary and less direct phrasing.
three is their number
Inverts the original structure, placing emphasis on the number itself.
the number of them is three
Rephrases to clarify that it's about the quantity of people.
FAQs
What does "they number three" mean?
The phrase "they number three" means that there are three individuals or items being referred to. It's a somewhat formal way of stating a quantity.
Is it correct to say "they number three"?
Yes, "they number three" is grammatically correct, although it's not the most common way to express this idea. It's more formal than saying "there are three of them".
What can I say instead of "they number three"?
You can use alternatives like "there are three", "the total is three", or "they are three in number", depending on the context.
In what contexts is it appropriate to use "they number three"?
The phrase "they number three" is most appropriate in formal writing or when aiming for a slightly elevated or literary tone. It would be less common in everyday conversation.
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Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Source & Trust
83%
Authority and reliability
3.9/5
Expert rating
Real-world application tested