Used and loved by millions
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
their number
Grammar usage guide and real-world examplesUSAGE SUMMARY
"their number" is a correct and usable phrase in written English.
It usually refers to a group of people or objects, and can be used in a variety of contexts. For example, "The school sent out a survey to get feedback from their students; their number was impressive."
✓ Grammatically correct
News & Media
Science
Formal & Business
Wiki
Encyclopedias
Alternative expressions(2)
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
60 human-written examples
Some love their number because it's theirs.
News & Media
Their number varies.
Encyclopedias
"They all have their number".
News & Media
What is their number?
News & Media
Their number was 11872.
News & Media
Their number runs into the millions.
News & Media
But one of their number was absent.
News & Media
Their number, however, is gently declining.
News & Media
Strict registration requirements reduced their number dramatically.
News & Media
Persecution has whittled their number down.
News & Media
Soon their number will begin to shrink.
News & Media
Expert writing Tips
Best practice
When using "their number", ensure the context clearly identifies the group or entity to which the number refers. Avoid ambiguity by providing specific details or context.
Common error
Avoid using "their number" when the antecedent is unclear. Ensure the pronoun "their" has a clear and unambiguous referent to prevent confusion.
Source & Trust
83%
Authority and reliability
4.5/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "their number" functions primarily as a noun phrase, where "their" is a possessive pronoun modifying the noun "number". Ludwig AI confirms it's often used to refer to a quantity, an amount, or a unique identifier associated with a group or entity.
Frequent in
News & Media
45%
Science
20%
Formal & Business
15%
Less common in
Wiki
10%
Encyclopedias
5%
Reference
5%
Ludwig's WRAP-UP
In summary, "their number" is a grammatically correct and frequently used phrase that serves to indicate the quantity, amount, or specific identifier of a group or entity. Ludwig AI confirms its usage is widespread across various contexts, including News & Media, Science, and Formal & Business writing. To ensure clarity, it's important to establish a clear antecedent for "their". While the phrase is versatile, being mindful of the context and avoiding ambiguity are crucial for effective communication.
More alternative expressions(10)
Phrases that express similar concepts, ordered by semantic similarity:
how many they are
Directly asks for the numerical size of a group.
the amount they have
Focuses on the quantity or amount possessed by a group, rather than a specific identifier.
the figure they represent
Emphasizes a numerical value that represents a group or entity, often in statistics or data.
the total of their members
Highlights the collective size of a group, often used in formal contexts.
the count of individuals in their group
A more formal and precise way of referring to the number of people belonging to a specific group.
the quantity of items they possess
Replaces a general count with the amount of possessions.
the amount of things they own
Refers to the number or quantity of items that belong to a specific group.
their contact details
Shifts the focus to methods of communication, such as phone numbers or email addresses.
their identification code
Specifies a unique identifier assigned to a group or entity.
the digits they are assigned
Refers to numerical identifiers assigned to individuals or entities, emphasizing the assigned nature of the numbers.
FAQs
How can I use "their number" in a sentence?
You can use "their number" when referring to a group's quantity or a specific identifier assigned to them. For example, "The refugees grew in number, and their number continues to increase daily".
What does "their number" mean?
The phrase "their number" can refer to the quantity or amount of something belonging to a group, or it can refer to a specific telephone number or code associated with a group.
What can I say instead of "their number" when referring to contact information?
If you're referring to contact information, you can use alternatives like "their contact details" or "their phone number".
Is it always clear what "their number" refers to?
No, it's important to provide context. If you just say "their number is declining", the readers may not know who you are talking about. Adding context helps the clarity of the sentence.
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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
4.5/5
Expert rating
Real-world application tested