Isn't it obvious it's 2
2 half dollars
Two half-dollars otherwise known as a fifty cent piece make a dollar.
A half-dollar is $0.50 ( fifty cents); three half-dollars is 3(.50) = $1.50 ( one dollar and fifty cents)
one half of a dollar
a whole dollar, or one.
Fifty cents doesn't make one dollar. It is only half of a dollar. To get a dollar you need 4 quarters or 2 fifty cent pieces.
Two and a half dollars.
ONE
one hundred dollars
One half of five dollars is two dollars and fifty cents. This is calculated by dividing five by two, which equals 2.5. Therefore, in dollar terms, it is $2.50.
There are 10 quarters in 2 and a half. Since one dollar is equal to four quarters, 2.5 dollars (or 2 and a half) equals 2.5 × 4 = 10 quarters.
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.