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

It is currently 22 Nov 2019, 06:22

Close

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
Your Progress

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

Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.

Close

Request Expert Reply

Confirm Cancel

The product of the …five smallest two-digit prime numbers

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:

Hide Tags

Find Similar Topics 
Retired Moderator
User avatar
Status: 2000 posts! I don't know whether I should feel great or sad about it! LOL
Joined: 04 Oct 2009
Posts: 954
Location: Peru
Schools: Harvard, Stanford, Wharton, MIT & HKS (Government)
WE 1: Economic research
WE 2: Banking
WE 3: Government: Foreign Trade and SMEs
The product of the …five smallest two-digit prime numbers  [#permalink]

Show Tags

New post 09 Aug 2012, 09:57
4
00:00
A
B
C
D
E

Difficulty:

  55% (hard)

Question Stats:

63% (01:33) correct 37% (01:24) wrong based on 304 sessions

HideShow timer Statistics

The product of the …five smallest two-digit prime numbers is closest to which of the following powers of 10?

(A) \(10^9\)
(B) \(10^8\)
(C) \(10^7\)
(D) \(10^6\)
(E) \(10^5\)

A faster way to solve it?

Source: http://www.gmathacks.com

_________________
"Life’s battle doesn’t always go to stronger or faster men; but sooner or later the man who wins is the one who thinks he can."

My Integrated Reasoning Logbook / Diary: http://gmatclub.com/forum/my-ir-logbook-diary-133264.html

GMAT Club Premium Membership - big benefits and savings
Most Helpful Expert Reply
Math Expert
User avatar
V
Joined: 02 Sep 2009
Posts: 59264
Re: The product of the …five smallest two-digit prime numbers  [#permalink]

Show Tags

New post 09 Aug 2012, 14:54
2
4
The product of the …five smallest two-digit prime numbers is closest to which of the following powers of 10?
(A) \(10^9\)
(B) \(10^8\)
(C) \(10^7\)
(D) \(10^6\)
(E) \(10^5\)

One can also use the following approximation:

\(11*13*17*18*23\approx{10*10*20*20*25}=100*10,000=10^6\)

Answer: D.

Similar question to practice:
the-product-of-the-fir-st-eight-positive-even-integers-is-128135.html
the-product-of-all-the-prime-numbers-less-than-20-is-closest-135192.html (from OG)

Hope it helps.
_________________
General Discussion
Director
Director
User avatar
Joined: 22 Mar 2011
Posts: 584
WE: Science (Education)
Re: The product of the …five smallest two-digit prime numbers  [#permalink]

Show Tags

New post 09 Aug 2012, 10:29
3
metallicafan wrote:
The product of the …five smallest two-digit prime numbers is closest to which of the following powers of 10?
(A) \(10^9\)
(B) \(10^8\)
(C) \(10^7\)
(D) \(10^6\)
(E) \(10^5\)

A faster way to solve it?

Source: http://www.gmathacks.com


The product is 11*13*17*19*23

Try some approximation:
10*15*15*20*20 = 4,000*225=900,000, this would be somewhat smaller than the real product.
10*15*15*20*25 = 2250*500=1,250,000, this for sure is larger.
My bet is \(10^6\).
_________________
PhD in Applied Mathematics
Love GMAT Quant questions and running.
Target Test Prep Representative
User avatar
V
Status: Founder & CEO
Affiliations: Target Test Prep
Joined: 14 Oct 2015
Posts: 8456
Location: United States (CA)
Re: The product of the …five smallest two-digit prime numbers  [#permalink]

Show Tags

New post 27 Sep 2018, 17:18
1
metallicafan wrote:
The product of the …five smallest two-digit prime numbers is closest to which of the following powers of 10?

(A) \(10^9\)
(B) \(10^8\)
(C) \(10^7\)
(D) \(10^6\)
(E) \(10^5\)


The product of the 5 smallest two-digit primes is 11 x 13 x 17 x 19 x 23, which we can approximate as the product 10 x 10 x 20 x 20 x 20 = 800,000. We see that this is closest to 1,000,000, or 10^6.

Answer: D
_________________

Scott Woodbury-Stewart

Founder and CEO

Scott@TargetTestPrep.com
TTP - Target Test Prep Logo
122 Reviews

5-star rated online GMAT quant
self study course

See why Target Test Prep is the top rated GMAT quant course on GMAT Club. Read Our Reviews

If you find one of my posts helpful, please take a moment to click on the "Kudos" button.

GMAT Club Bot
Re: The product of the …five smallest two-digit prime numbers   [#permalink] 27 Sep 2018, 17:18
Display posts from previous: Sort by

The product of the …five smallest two-digit prime numbers

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  





Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne