English Language & Usage Stack Exchange is a question and answer site for linguists, etymologists, and serious English language enthusiasts. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

Which sentence is grammatically correct:

  • I'm a hundred percent sure
  • I'm hundred percent sure

Any help would be greatly appreciated!

share|improve this question
up vote 7 down vote accepted

Hundred by itself does not constitute a quantity. You must have a number in some form:

I'm one hundred percent sure.

or something else to provide a number — like "a" which denotes a singular quantity.

I'm a hundred percent sure.

Without a number it is similar to saying

I have milliliters of water. [How many milliliters?]

share|improve this answer
Thank you very much – šljaker May 24 '12 at 21:28

One hundred is usually not said in English unless wishing to distinguish it with TWO, for example; in this case, A hundred is the idiomatic way of referring to ONE hundred. And, in agreement with a previously posted answer, without saying A (=ONE), no quantity would be indicated.

share|improve this answer

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.