"forty eleventh" is a term to explain any number large or small (it, in that case is fictional though,) or is just plain bad grammar
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There is no such number as forty ten. If you mean it as fifty, then the answer would be 2500. If you mean it as fifty times forty times ten, the answer is 20000.
forty
'Forty point zero four four'.
forty-five
86.90909090 recurring or 86 and one eleventh.