GMAT Question of the Day - Daily to your Mailbox; hard ones only

 It is currently 20 Jan 2019, 15:20

### GMAT Club Daily Prep

#### Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

## Events & Promotions

###### Events & Promotions in January
PrevNext
SuMoTuWeThFrSa
303112345
6789101112
13141516171819
20212223242526
272829303112
Open Detailed Calendar
• ### FREE Quant Workshop by e-GMAT!

January 20, 2019

January 20, 2019

07:00 AM PST

07:00 AM PST

Get personalized insights on how to achieve your Target Quant Score.
• ### GMAT Club Tests are Free & Open for Martin Luther King Jr.'s Birthday!

January 21, 2019

January 21, 2019

10:00 PM PST

11:00 PM PST

Mark your calendars - All GMAT Club Tests are free and open January 21st for celebrate Martin Luther King Jr.'s Birthday.

# Am I supposed to memorize SQRTs?

Author Message
TAGS:

### Hide Tags

Manager
Joined: 21 May 2012
Posts: 92
Location: United States (CA)
Am I supposed to memorize SQRTs?  [#permalink]

### Show Tags

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

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

Current Student
Joined: 28 Mar 2012
Posts: 311
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]

### Show Tags

01 Jun 2012, 00:09
1
1
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.
Math Expert
Joined: 02 Sep 2009
Posts: 52296
Re: Am I supposed to memorize SQRTs?  [#permalink]

### Show Tags

01 Jun 2012, 01:39
1
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.
_________________
Non-Human User
Joined: 09 Sep 2013
Posts: 9460
Re: Am I supposed to memorize SQRTs?  [#permalink]

### Show Tags

04 Mar 2018, 08:11
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
_________________
Re: Am I supposed to memorize SQRTs? &nbs [#permalink] 04 Mar 2018, 08:11
Display posts from previous: Sort by