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Write an expression to show the total cost.
The total cost is a sum. It equals
$31.50 + $14.97 + $6.50.
Use the Commutative Property of Addition to rearrange the terms.
$31.50 + $14.97 + $6.50 = $31.50 + $6.50 + $14.97.
Use the Associative Property of Addition to group the terms.
By the Associative Property of Addition,
$31.50 + $6.50 + $14.97 = ($31.50 + $6.50) + $14.97.
Add the terms within the parentheses.
Adding the terms within the parentheses,
($31.50 + $6.50) + $14.97 = $38.00 + $14.97.
Think of $14.97 as $0.03 less than $15.00.
Since 14.97 is $0.03 less than $15.00, we can express
$38.00 + $14.97 as $38.00 + $15.00 – $0.03.
Adding and subtracting, we get
$38.00 + $15.00 – $0.03
= $53.00 – $0.03
So, the total cost is $52.97.
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