Hey there Maria!
Think of it this way:
18 divided by 18 is 1, right? and 17 divided by 16 is going to be larger than one, because 16 goes into 17 one time with one as a remainder.
So, Greg would not be correct because while 18 is larger than 17, the fraction
is an improper fraction, making it larger than
, which would equal 1!