What is the difference between these two sentences:
I’m one hundred percent sure.
I’m a hundred percent sure.
For me the only difference between the two sentences is that the second sentence is more formal.
Learn English – I’m a / one hundred percent sure
difference
Related Solutions
The first example is incorrect. The second and third examples are both correct. Which one you use is mostly a matter of preference, although a hundred appears more frequently than one hundred. There is also another form, an hundred, which was common in the past, but has mostly fallen out of use.
See Google Ngram Viewer: a hundred, an hundred, one hundred:
The first one makes sense insofar as it means that "He is not a member of our group." The second one does not make sense in the context of the former statement even though "none" comes from Old English and is a per se contraction of "not one". I would not ever say, "He is none of us" to mean that he is not part of our group; I would use "He is none of us" to tell the person that there is not one person here who is the individual that he is looking for. Despite this oddity, most of the time, "not one" and "none" can be used interchangeably. Could one possibly interpret "He is not one of us" and "He is none of us" as equivalent? Yes, one probably could; however, it would cause a lot of confusion. So, to clarify for you, SovereignSun, here is how I, as a native speaker, would interpret the two statements:
"He is not one of us." (He is not in our group.)
"He is none of us." (The person whom you are looking for is not here.)
Best Answer
The two phrases have the same basic meaning, but native speakers tend to use the "one hundred percent sure" wording in order to to give a greater impression of certainty. In speech, you can emphasise the word "one" more strongly than "a" and the phrase is spoken with a regular rhythm as ONE HUNdred perCENT SURE.