No because 13/15 is slightly bigger than 5/6.
If you convert them to a common denominator, 13/15 = 26/30 while 5/6 = 25/30.
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28
13/15
5/6 = 15/18 so it is bigger
2/3 = 20/30 5/10 = 15/30 20 is bigger than 15.
3 over five 2/3 = 10/15, and 3/5 = 9/15. 2 over 3 (10/15) is obviously bigger than 3 over 5 (9/15).