I've just got the answer from a native speaker, that 1900's refers to 1900-1999 (one hundred years)
and how to read 1910's and 2000's? Are they refer to a ten- year and 1000 year respectively? Can you give me both the way of reading and meaning?
Can you make some other examples to make me get out of such questions completely?Thank you very much.
I think you got a wrong answer. Take a look at this.
It should be written with no apostrophe. 1900s.