ok so we need the bottom number to be the same to compare
remember that when x=x, x/x=1 so
9/9=1
if you multiply anything by 1 it is the same
to change the bottom number you have the multipy the whole fraction by 1
so we have
7/8 and 8/9
we need to make 8 and 9 into a common number
jus muitply 8 by 9 and 9 by 8
so
7/8 times 9/9=63/72
8/9 times 8/8=64/72
so we have
7/8 vs 8/9
63/72 vs 64/72
63<64
7/8<8/9
8/9 is bigger
