540 divided by 90 is 6. You can find this by setting up a proportion and reducing.
540/90
1. Divide both 540 and 90 by the same common factor until you can no longer reduce.
ex. 540 divided by 10 is 54 and 90 divided by 10 is 9
Thus, we will have 54/9
From here, we can divide 54 by 9 and 9 by 9.
Thus, we now have 6/1 which is just 6.