Answer :

Saturn has thirty-three moons. 


         Have is not the right verb for this sentence. 
         Also, thirtyhree is not a word. :)But, since thirty-three is one thing, it has a             hyphen.  
The word thirty three is a word and it represents a number the T is missing on the word three but instead of "have" it should've said "Saturn has thirty three moons"

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