How many dollars are 100 quarters? A quarter (1/4) is an Americanism for 25 cents. It takes the sum of 4 quarters to derive US$1 (4 * 25 = 100 cents = US$1). So divide 100 by 4, and you get US$25 or multiply 25 by 100 = 2500 cents and given there are 100 cents in US$1, divide 2500 by 100 = US$25 .