I want to write a sentence, like:

The investigation can reveal the cause in 50% (of) cases.

Google search within the .gov domain shows zero results for both "50% cases" and "50% of cases." Am I missing something?

If I write percents separately (50 %), I get some results, but still only few.

2 Answers 2


If this is in academic writing, I'd usually write percentages as numbers, so 50%.

The 'of' is needed as well, so 50% of cases.

I don't think it really matters if one form of expression appears more than the other - people have different writing styles.

So to iterate: "the investigation can reveal the cause of 'X' in 50% of cases" is fine :)

  • Yes, 50% of sounds right to me as well.
    – Jan
    Commented Aug 29, 2018 at 10:24

Your search may also have been affected by a matter of style.

Depending on context, if half is not used, there are two other variations:

fifty percent

According to The Chicago Manual of Style (17th ed.), 9.2:

In nontechnical contexts, Chicago advises spelling out whole numbers from zero through one hundred and certain round multiples of those numbers . . .

      Thirty-two children from eleven families were packed into eight vintage Beetles.
      Many people think that seventy is too young to retire.
      The property is held on a ninety-nine-year lease.
      According to a recent appraisal, my house is 103 years old.
      The three new parking lots will provide space for 540 more cars.
      The population of our village now stands at 5,893.

But in 9.3:

Many publications, including those in scientific or journalistic contexts, follow the simple rule of spelling out only single-digit numbers and using numerals for all others.

So, you might want to try another search using fifty percent to see if that turns up a different result in your case.

But unless you are following a particular style guide, how you phrase the concept is simply a matter personal preference.

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