450
As is. It is already rounded to the nearest tens place.
You do nothing. 450 is already rounded to the nearest ten.
450
450
450
450
450
$65.16 rounded to the nearest dollar = $65 65.16 cents rounded to the nearest dollar = $1
$1002 is $1002 when rounded to the nearest dollar. 1002 cents is $10 if rounded to the nearest dollar.
86.24 cent, rounded to the nearest dollar, is 1 dollar.
$682.00 is already rounded to the nearest dollar.