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# Am I supposed to memorize SQRTs?

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Manager
Joined: 21 May 2012
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Am I supposed to memorize SQRTs? [#permalink]  31 May 2012, 12:46
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

$$\frac{sqrt3-sqrt2}{1}$$

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Senior Manager
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Re: Am I supposed to memorize SQRTs? [#permalink]  01 Jun 2012, 00:09
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

$$\frac{sqrt3-sqrt2}{1}$$

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.
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Re: Am I supposed to memorize SQRTs? [#permalink]  01 Jun 2012, 01:39
Expert's post
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

$$\frac{sqrt3-sqrt2}{1}$$

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.
_________________
Re: Am I supposed to memorize SQRTs?   [#permalink] 01 Jun 2012, 01:39
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