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Bjehnsen3720
Bjehnsen3720
27.02.2020 • 
Mathematics

Tyler evaluates the expression -621,044 - (-214,318) and gets an answer of -400,080.

Is this a reasonable answer?
A.
Since -621,044 rounds to -630,000 and -214,318 rounds to -220,000, the difference rounds to -410,000. His answer of -400,080 rounds to -400,000. So, it is not reasonable.
B.
Since -621,044 rounds to -620,000 and -214,318 rounds to -220,000, the difference rounds to -400,000. His answer of -400,080 rounds to -400,000. So, it is reasonable.
C.
Since -621,044 rounds to -620,000 and -214,318 rounds to -210,000, the difference rounds to -410,000. His answer of -400,080 rounds to -400,000. So, it is not reasonable.
D.
Since -621,044 rounds to -610,000 and -214,318 rounds to -210,000, the difference rounds to -400,000. His answer of -400,080 rounds to -400,000. So, it is reasonable.

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