If you have a fraction, take one number and put a different number on top or underneath, for example if you have 2 cats and 3 dogs, the ratio from cats to dogs would be 2:3 but if you did 2 cats to the total number of animals, you would add 2 and 3 and get 5, so the ratio would be 2:5.
all you have to do is divide the bigger number by the smaller number. for example if you are trying to find the ratio for 72 to 9 you divide 72 by 9 you get 8 9 goes into 72 8 times and itself 1 time so it would be 8 to 1
