example:
2/4 u can divide it to 2/2 and the answer will be 1/2 or 2/4 divided by 2/2=1/2
u can divide 4/8 by 4/4 or 2/2 but if u chose the 2/2 u will have to repeat again
4/8 divided by 2/2 = 2/4 divided by 2/2 = 1/2
but if u directly used 4/8 divided by 4/4 the answer will be 1/2
4/8 divided by 4/4 = 1/2
Hope it helps! :)