Well first 6/6 it’s equal to 1
So your next step would be
24/30 divide by 1
So any expression divided by one stays the same.
24/30
And to finish you are going to reduce each side by 6 in other words you are going to divide.
24 divided by 6 is 4
30 divided by 6 is 5
So your answer is 4/5 or 0.8
I hope that helps:)