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Square root help? Is there a fast way to think about this

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by oquiella » Sun Sep 27, 2015 6:32 pm
Of the following numbers, which one is the third greatest?

A. 2 I Square Root 2
B. Square Root 2 + 1
C. 1- Square Root 2
D. Square root 2 -1
E. Square root 2


Sorry couldnt find my square root sign. Feel free to ask question[/list]
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by JohnTran » Sun Sep 27, 2015 8:09 pm
For this type of question. I quickly calculate with square root 2 as 1.4

A. Square root 2 = 1.4
B. 2.4
C. -0.4
D. 0.4
E. 1.4

My answer is B>A,E>D>C
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by Brent@GMATPrepNow » Sun Sep 27, 2015 8:19 pm
JohnTran wrote:For this type of question. I quickly calculate with square root 2 as 1.4

A. Square root 2 = 1.4
B. 2.4
C. -0.4
D. 0.4
E. 1.4

My answer is B>A,E>D>C
Perfect (fast) solution.

Everyone should be sure to memorize the following roots for test day:
√2 ≈ 1.4
√3 ≈ 1.7
√5 ≈ 2.2

Cheers,
Brent
Brent Hanneson - Creator of GMATPrepNow.com
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