50th or fiftieth anniversary

English as a Second Language English Vocabulary, Grammar and Idioms
1

50th anniversary, fiftieth anniversary

Which is more commonly written by native speakers?

Thanks.

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2

I would suggest - 50th.

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3

It is common practice to write 1 to 9 in words, and from 10 in figures. If so, fiftieth is better written as 50th unless there is a purpose behind showing it in words (as in legal and commercial documents)!

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