The spelling "thirtieth story" is the correct written form of "30th story" (of a building).
*The UK term for a building level is spelled storey.
thirtieth
Thirtieth.
The ordinal number 30th is spelled thirtieth.
The ordinal number 30th is spelled thirtieth.
Thirtieth.
The correct spelling for 30th is "thirtieth".
"not thirtieth." There really isn't a precise single-word antonym for it.
The correct term is "thirtieth" when referring to the ordinal number that comes after the twenty-ninth. It is used in contexts such as dates (e.g., "the thirtieth of the month") or to describe a position in a sequence. "30th" is simply a numerical representation of "thirtieth."
The thirtieth sultan of the Ottoman Empire was Mahmud II.
Thirtieth means being one of 30 equal parts. So one thirtieth is 1/30 and 1/30 as a decimal is 0.0333...
Thirtieth.
Chewbacca is how you spell it.