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To compare the fractions 16/21 and 8/9, we can convert them to have a common denominator.
First, find the least common multiple of 21 and 9 which is 63.
16/21 = 48/63
8/9 = 56/63
Now we can see that 56/63 (8/9) is greater than 48/63 (16/21).
So, 8/9 is greater than 16/21.