How many quarters are in 4 and a half?

There are 18 quarters in 4 and a half dollars. This is because there are 4 quarters in a dollar, so 4 dollars would have 4 x 4 = 16 quarters. Additionally, half a dollar is equivalent to 2 quarters, making a total of 16 + 2 = 18 quarters in 4 and a half dollars.