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You can double check if you have the correct answer by this equation:
680.46(cost in Canadian dollars)* $.8817(what the Canadian dollar is worth against the U.S dollar)= 599.96 ( the answer is off due to rounding but it equals the U.S selling price)

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$600(Cost of the surface in U.S dollars) X 1.1341= $680.46 in Canadian dollars

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Hanna Lind, who lives in Canada wanted to buy a new Microsoft Surface 3. She went on eBAy and found that the cost would be 600 U.S Dollars. Wanting to know how much it would cost in Canadian dollars, Hanna consulted the following Wall Street Journal's currency table and found that a Canadian dollar was worth $ .8817 in U.S dollars. Therefore each Canadian dollar it would cost $1.1341 to buy a U.S good.

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Dividing decimals completely | Arithmetic operations | 5th grade | Khan Academy

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Rounding Decimals to a Specified Place Value

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Rounding Decimals to a Specified Place Value

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The textbook definition is a decimal number with digits to the right of a decimal point(the center of the decimal numbering system) indicating that decimals, like fractions, are parts of a whole that are less than one.