One quarter is equal to 25 cents, To express it as a fraction of a dollar you have to divide the cents by 100, since 1 dollar = 100cents:
So, expressed as a fraction of a dollar you can say that one quarter is equal to $0.25 or 25/100
To determine how much do 3 quarters represent as a fraction of a dollar you have to multiply 0.25 by 3
So, 3 quarters expressed as a fraction of a dollar is $0.75 or 75/100.