Subtract money amounts

1/ Aidan has $5.00 to buy a can of tennis balls that cost $3.79. How much change should he get back?

2/ Sylvia has $10.00 to buy a hairbrush that cost $ 6.88. How much change should she get back?

2 answers

$5.00
-3.79 Cost of tennis balls
-------
$2.21 answer

$10.00
- 6.88
--------
$3.12 Answer
Elvis bought a CD for $15.99. He paid with $ 13.00and 30 dimes. How much change did Elvis get back?

15.99
13.00
- 30
.............
269

2/ tawny has 4 one- dollar bills , 20 dimes, and 100 pennies. She bought a knit cap , which cost $ 6.26 . How much change did Tawny get back?

Don't know