6.45 is like 645 cents. 45 makes it round down since 100 cents= $1.
Rounded, 645 would be 600, or 600 cents. Since 100 cents =$1, 600 cents = $6.
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645 rounded to the nearest ten would simply be 650.
640
Rounded to the nearest dollar, $10.72 is approximately equal to $11.
98 rounded off to the nearest half dollar is $1.00.
$23 in the nearest dollar to $23.26