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
of this number
Grammar usage guide and real-world examplesUSAGE SUMMARY
"of this number" is a correct and usable phrase in written English.
It can be used to refer to a specific number that is either already mentioned or understood by context. For example, "We studied a total of 500 people, of which 300 reported positive results." Here, "of this number" could be used to refer to the 300 people who reported positive results.
✓ Grammatically correct
News & Media
Academia
Science
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
Ten of this number were actually scrapped.
Academia
Police have arrested fewer than 5percentt of this number.
News & Media
"How could you find half of this number?
News & Media
Grotius, Puffendorf, Wolf, & Vattel are of this number.
Academia
Some industry executives have promoted the importance of this number.
News & Media
Accurate measurement of this number can limit possible centromere architectures.
Science
The answer should be close to 1.6180339887... What's the significance of this number?
News & Media
Of this number just 450,000 were bought for more than £18.
News & Media
Of this number, 22 have made it through the selection process to the wilderness weekends.
News & Media
"I'm going to try to get rid of this number," the woman said.
News & Media
Of this number, most MPI poor people – 69.6% – live in middle-income countries.
News & Media
Expert writing Tips
Best practice
Ensure that the "number" you are referring to is clearly defined in the preceding context to avoid ambiguity.
Common error
Avoid using "of this number" if the number being referenced is vague or not immediately apparent to the reader. Always make sure the antecedent is clear.
Source & Trust
84%
Authority and reliability
4.5/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "of this number" functions as a prepositional phrase that modifies a noun or pronoun, typically indicating a subset or portion of a previously mentioned quantity. Ludwig's examples confirm its use in specifying a part of a whole. As Ludwig AI explained, it's a correct phrase.
Frequent in
News & Media
45%
Academia
23%
Science
20%
Less common in
Encyclopedias
5%
Wiki
5%
Formal & Business
2%
Ludwig's WRAP-UP
In summary, the phrase "of this number" is a grammatically sound and widely used prepositional phrase that serves to specify a subset or portion of a previously mentioned quantity. As confirmed by Ludwig AI, this phrase is correct. It is prevalent across various contexts, including news, academia, and science. When using "of this number", ensure that the referenced number is clear to your audience. Consider alternatives like "from this total" or "out of this amount" for slight variations in emphasis. Ludwig's examples provide solid guidance on its application.
More alternative expressions(6)
Phrases that express similar concepts, ordered by semantic similarity:
from this total
Emphasizes the extraction or selection from a complete set.
out of this amount
Highlights the proportion taken from a defined quantity.
a portion of this figure
Refers to a segment or share of the specified numerical value.
within this quantity
Indicates inclusion within a specific amount or number.
a percentage of this value
Focuses on expressing a proportional part of a given value.
some of this count
Indicates an unspecified quantity of a number of items.
a fraction of this total
Highlights the part-whole relationship in reference to a total.
a segment of this figure
Identifies a distinct piece of a larger numerical entity.
a slice of this amount
Implies taking a piece of a defined quantity, emphasizing the selection aspect.
a proportion of this figure
Emphasizes the relative quantity compared to the initial amount.
FAQs
How can I use "of this number" in a sentence?
You can use "of this number" to specify a portion or subset of a previously mentioned quantity. For example: "There were 100 applicants; "of this number", only 20 were interviewed".
What are some alternatives to "of this number"?
Alternatives include "from this total", "out of this amount", or "a portion of this figure". The best choice depends on the specific context.
Is it ever incorrect to use "of this number"?
It's not grammatically incorrect, but it can be unclear if the number it refers to isn't explicitly stated or easily understood from the context. Ensure clarity to avoid confusing your reader.
How does "of this number" compare to "from this number"?
"Of this number" implies a part taken from a whole, whereas "from this number" is less common and often suggests a starting point or source. "Of this number" is generally used to indicate a proportion or subset.
Editing plus AI, all in one place.
Stop switching between tools. Your AI writing partner for everything—polishing proposals, crafting emails, finding the right tone.
Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Source & Trust
84%
Authority and reliability
4.5/5
Expert rating
Real-world application tested