I can't think of a much simpler form than "18".
Perhaps you meant 1/8? A simple form would be 0.125, but it's debatable whether that is any simpler than 1/8.
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18/65 is in its simplest form
18 is already in simplest form.
18/5 is in its simplest form.
18/7 is in its simplest form.
18% = 18/100 = 9/50 in its simplest form