Multiplication?? because 5.5 times 3 is 16.50 but to get 5.5 you have to divide 16.50 by 3...
Multiplication or division (I would go with multiplication)
Call the number of CD's x. Then, we have the equation 3x = $16.50, which I would say is multiplication, or, if you divided 3 on both sides, division. If there is only one correct answer I would go with multiplication though.
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rounding to the nearest thousandth would be 452,000