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16 Sep 2014, 00:59
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What is the value of \(8,988*9,012\)?
A. 80,998,866
B. 80,998,956
C. 80,999,856
D. 80,999,986
E. 80,999,996
A. 80,998,866
B. 80,998,956
C. 80,999,856
D. 80,999,986
E. 80,999,996
16 Sep 2014, 00:59
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Official Solution:
What is the value of \(8,988*9,012\)?
A. 80,998,866
B. 80,998,956
C. 80,999,856
D. 80,999,986
E. 80,999,996
\(8,988*9,012 = \)
\(=(9,000 - 12)(9,000 + 12) =\)
\(=9,000^2 - 12^2 = \)
\(=81,000,000 - 144 = \)
\(=80,999,856\).
Answer: C
What is the value of \(8,988*9,012\)?
A. 80,998,866
B. 80,998,956
C. 80,999,856
D. 80,999,986
E. 80,999,996
\(8,988*9,012 = \)
\(=(9,000 - 12)(9,000 + 12) =\)
\(=9,000^2 - 12^2 = \)
\(=81,000,000 - 144 = \)
\(=80,999,856\).
Answer: C
06 Nov 2016, 15:44
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Referencing The GMAT Club Math Book (pg.13)
To find the n of last digits of the product = product of n digits of the integers.
By looking at the answer choices, the answers very at the hundred digit places.
A = 866, B =956, C=856, D= 986, E = 996.
Thus we want to find the last 3 digits of the product in order to find the answer.
8988 * 12 = 10856. (note that it's not necessary for you to calculate beyond 856). Thus the only answer that contains 856 is C.
To find the n of last digits of the product = product of n digits of the integers.
By looking at the answer choices, the answers very at the hundred digit places.
A = 866, B =956, C=856, D= 986, E = 996.
Thus we want to find the last 3 digits of the product in order to find the answer.
8988 * 12 = 10856. (note that it's not necessary for you to calculate beyond 856). Thus the only answer that contains 856 is C.
