Thanks a lot for helping.
When you say 'a hundred' or 'a million' you're just giving an order of magnitude, and the exact figure doesn't matter. So much so that when you say 'a million reasons not to do this' it obviously isn't important how many exactly.
When you say 'one million' or 'one thousand' then you're usually being quite precise with the figure you're giving : 'I've won a million pesos at the lottery' (lucky you even though I suspect this isn't that much) or 'This village is one thousand inhabitants'.
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If I were to say I have a million dollars or that I have one million dollars I have not changed anything. This is a lot like wheather it is pronounced a or uh, do what seems right at the time.
Sanzdifference betweenNo difference. A hundred is one hundred. One hundred is a hundred.
Use "one" instead of "a" when working with numbers as an accountant, mathematician, or scientist might do.
I believe that colloquially, interchanging 'a hundred' with 'one hundred' would be ok if you were an accountant, mathematician, or scientist because it does not change the number, but if you are a writer perhaps, or other type of proffessional that deals with grammar and the English language, then you would want to be correct in writing or speaking rather than mathematically. I have been trying to figure out what the difference is between 'a hundred' and 'one hundred' for a good part of this day only because I want to prove wrong what it says on the vanilla visa website: 'one card. a million options.' which is actually terrible anyway because neither of those are complete sentences. The only thing I have come up with is that 'a million' is more general and 'one million' is more specific. For example: "There are a million trees in my backyard!" versus "One million pennies remain in your bank account."
Anyway thanks to all who reply as I would love to find an answer to this question.
People are waiting to help.
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