yes unless you were asked to make it a mixed number because then it would be simplified to 1 1/8
120 over 135 in lowest terms is 8/9
8 over 72 = 1/9
8/9
4/9
8/9
8/9
8/9
9/8 or 11/8
4/9
8/9 * 4/7 = (8*4)/(9*7) = 32/63 which is already in lowest terms
Yes because 56/63 = 8/9 in its lowest terms
7/10 minus 9/8 = -17/40 in its lowest terms