I was asked by a French colleague, and had no clear answer, whether it's more correct to say "One thousand five hundred" or "fifteen hundred" when speaking the number 1500. Putting aside how we say dates, which have their own formula.
After some thought, my best answer was I tended to say "fifteen hundred" when dealing with abstract things ("fifteen hundred dollars") that I tend to think of as a unit (when I think of $1500, I think of that sum, not of 1500 individual dollar bills), but "one thousand five hundred" when dealing with countable objects, like "there are one thousand five hundred marbles in the box."
I was wondering if there was a standard or guidance documents, possibly for broadcast, that would provide some sort of structured answer to the question.