Question

Watch is greater 9/10 or 10/11

Answer 1

Comparing fractions with different denominators is simply with this simple method!
Cross multiply
99  100 
9   10
10  11
100 is bigger than 99.
10/11 is bigger then 9/10

Answer 2

Well if you find the least common multiple of the two denominators, 10 and 11, that would be 110. Now just change the fractions, 99/110 and 100/110. 100/110 > 99/110, so the answer is 10/11.