Answer 1
5/8 and 16/21 (cross multiply)
5 x 21 and 16 x 8
105 < 128
Thus, 5/8 is smaller than 16/21.
Answer 2
If the question is: Is 5*8 bigger than 16*21, then you would multiply 5*8=40 and 16*21=336 and again 336>40, so either way the answer your question is no. If you are looking for some other function then you need to specify what that function is.
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5/8 is the same as 10/16 so it is bigger
The fraction 3/8 is equal to 6/16 so 5/16 is not bigger than 3/8.
7/10 - 1/6 = 21/30 - 5/30 = 16/30 = 8/15.7/10 - 1/6 = 21/30 - 5/30 = 16/30 = 8/15.7/10 - 1/6 = 21/30 - 5/30 = 16/30 = 8/15.7/10 - 1/6 = 21/30 - 5/30 = 16/30 = 8/15.
13
maybe eight 21 - 5 = 16 = 2 x 8