You have to divide each number with the common number that goes into both. (% is the dividing sign)
In this case: 28 % by 7 is 4
84 % by 7 is 12.
Then from there you do 4 % by 4 is 1
12 % by 4 is 3.
Therefore, the answer is 1/3.
You divide if there is a number which goes into each number, I really hope this helped .
