I'd agree with all of this. I think I myself would almost always prefer "forty-five hundred" to "four thousand, five hundred". For one thing, it's shorter.No,
forty-five hundred = four thousand five hundred = 4,500
"Forty-five hundred" is the most common way of expressing this in speech. The other way sounds slightly more formal.
Ex. 2200= twenty-two hundred
The area has enough seating for seventy-eight hundred (7,800) people.
X college has (5,550) fifty-five hundred (and) fifty undergraduate students.
But isn't this less common with numbers over 2,000 in French? For instance, in the example sentenced I came up with in post #4, wouldn't (the) French prefer the version with thousand (mille) in it?the same in french, 2 ways of saying 1980 :
mille neuf cent quatre-vingts
dix neuf cent quatre-vingts