Mark wants to round to the nearest hundred to estimate the sum of 271 and 582. He wrote 270 + 580 = 850.

Part A
What mistake did Mark make?
A.
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Mark should have rounded 271 to 250 and rounded 582 to 550: 250 + 550 = 800.
B.
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Mark should have rounded 271 to 250 and rounded 582 to 600: 250 + 600 = 850.
C.
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Mark should have rounded 271 to 300 and rounded 582 to 500: 300 + 500 = 800.
D.
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Mark should have rounded 271 to 300 and rounded 582 to 600: 300 + 600 = 900.
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Part B
What is the sum of 271 and 582 rounded to the nearest hundred?
A.300
B.850
C.900
D.1,000

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