5/12 is (108 and 1/3)% bigger than 1/5 .
another way of telling what is bigger is to covert them to decimal form (at least I think it is easier)
1/5 = .20
5/12=.416 (repeating 6)
so 5/12 (.416) is bigger then 1/5 (.20)
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1/3 = 0.333 and 5/12 = 0.41667 .. so 5/12
5/12 - 4/12 = 1/12
1 over 3 plus 1 over 12 equals 5 over 12
5/6 + 1/12 = 11/12
1/5 is the same as 2/10 so 3/10 is obviously larger.