You might not know it, but "thousand" is not one of the ten hundred most usual English words! https://github.com/aaron-em/ten-hundred-mode.el

I think this is English specific and could do more harm than good for someone with a different background. E.g. in my language counting anything > 1000 in hundreds would sound very weird.

"Ten hundred", "twenty hundred", etc. sound very weird in English, too, despite "eleven hundred", "twelve hundred", etc. being commonplace in at least the American dialect.

That said, "ten hundred" is hardly the weirdest thing about English prose written in ten-hundred-mode...