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# Am I supposed to memorize SQRTs?

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Current Student
Joined: 21 May 2012
Posts: 97
Location: United States (CA)
Am I supposed to memorize SQRTs? [#permalink]

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31 May 2012, 13:46
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.
Current Student
Joined: 29 Mar 2012
Posts: 319
Location: India
GMAT 1: 640 Q50 V26
GMAT 2: 660 Q50 V28
GMAT 3: 730 Q50 V38
Re: Am I supposed to memorize SQRTs? [#permalink]

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01 Jun 2012, 01:09
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Cares wrote:
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.

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.
Math Expert
Joined: 02 Sep 2009
Posts: 44298
Re: Am I supposed to memorize SQRTs? [#permalink]

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01 Jun 2012, 02:39
Expert's post
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BOOKMARKED
Cares wrote:
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.

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.
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Re: Am I supposed to memorize SQRTs? [#permalink]

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04 Mar 2018, 09:11
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Re: Am I supposed to memorize SQRTs?   [#permalink] 04 Mar 2018, 09:11
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# Am I supposed to memorize SQRTs?

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