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In the hopes of making things easier for me, I've been referring to centuries by their number range-- "the 1900's" rather than "the twentieth century". I've gotten one piece of feedback from someone who found it confusing, but how clear is it to most people who are reading this?
I find it confusing as well: the century already has a different name and the decade does not, so it's natural to assume "the 1900s" refers to the decade.
Also, I guess technically "the 1900s" includes 1900 but not 2000 and "the 20th century" includes 2000 but not 1900.