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Cares
Joined: 21 May 2012
Last visit: 13 Apr 2020
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31 May 2012, 13:46
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Are we expected to know sqrt of non-perfect squares?
I'm doing a MGMAT problem which required me to have knowledge of what \(sqrt2\) and \(sqrt3\) is. I can generally estimate but didn't know that they were ~1.7 and ~1.4. When I generally estimated I could make an educated guess but the problem is that the answer choices were so close that it was hard to guess.
Basically I needed to be able to estimate
\(\frac{sqrt3-sqrt2}{1}\)
Answers had 20%, 25%, 30%, 35%, 40% as choices.
I'm doing a MGMAT problem which required me to have knowledge of what \(sqrt2\) and \(sqrt3\) is. I can generally estimate but didn't know that they were ~1.7 and ~1.4. When I generally estimated I could make an educated guess but the problem is that the answer choices were so close that it was hard to guess.
Basically I needed to be able to estimate
\(\frac{sqrt3-sqrt2}{1}\)
Answers had 20%, 25%, 30%, 35%, 40% as choices.
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01 Jun 2012, 01:09
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Hi Cares,
You may remember the following square roots:
\sqrt{2}=1.41
\sqrt{3}=1.73
\sqrt{5}=2.24
\sqrt{6}=2.45
\sqrt{7}=2.65
\sqrt{8}=2.83
\sqrt{10}=3.16,
but I believe that in GMAT there won't be any questions requiring the decimal values of square roots. Also, there are no close enough choices in GMAT.
01 Jun 2012, 02:39
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For GMAT it's good to memorize following values:
\(\sqrt{2}\approx{1.41}\)
\(\sqrt{3}\approx{1.73}\)
\(\sqrt{5}\approx{2.24}\)
\(\sqrt{6}\approx{2.45}\)
\(\sqrt{7}\approx{2.65}\)
\(\sqrt{8}\approx{2.83}\)
\(\sqrt{10}\approx{3.16}\)
Check Number Theory chapter of Math Book: math-number-theory-88376.html
Hope it helps.
