It is already in lowest terms.
30 over 35 in the lowest terms = 6/7
12 over 30 in lowest terms is 2/5
15 over 30 reduced to lowest terms is 1/2
If you mean 30/55 then it is 6/11 in its lowest terms
11/15
24 over 30 written in lowest terms is 4/5
3
It is: 30/70 = 3/7.
It is: 30/40 = 3/4.
It is: 30/36 = 5/6
5/6
5/7