There are 40 quarters in $10. This is because one quarter is worth 25 cents, and four quarters make one dollar. Therefore, to find how many quarters make $10, you multiply 10 dollars by 4 quarters per dollar: 10 × 4 = 40 quarters. So, 40 quarters equal $10

. Additionally, a standard roll of quarters contains exactly 40 quarters, which also equals $10 in face value