Your question could be interpreted several ways.
If you meant to say What if one half of something is 9, then the something would be 18.
If you meant to say What is one half of 9, then the answer is 4 1/2.
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1/9 is half of 2/9
9 and one half = 19/2
Nine and one half rounded to the nearest half is nine and one half.
nine times one half is 9*1/2 =9/2 that is 4.5.
9 x 3/2 = 27/2 = 13 and a half