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

It is currently 22 Jan 2019, 12:58

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
Events & Promotions in January
PrevNext
SuMoTuWeThFrSa
303112345
6789101112
13141516171819
20212223242526
272829303112
Open Detailed Calendar
  • The winners of the GMAT game show

     January 22, 2019

     January 22, 2019

     10:00 PM PST

     11:00 PM PST

    In case you didn’t notice, we recently held the 1st ever GMAT game show and it was awesome! See who won a full GMAT course, and register to the next one.
  • Key Strategies to Master GMAT SC

     January 26, 2019

     January 26, 2019

     07:00 AM PST

     09:00 AM PST

    Attend this webinar to learn how to leverage Meaning and Logic to solve the most challenging Sentence Correction Questions.

M16-16

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

Hide Tags

 
Math Expert
User avatar
V
Joined: 02 Sep 2009
Posts: 52390
M16-16  [#permalink]

Show Tags

New post 15 Sep 2014, 23:59
00:00
A
B
C
D
E

Difficulty:

  5% (low)

Question Stats:

85% (00:46) correct 15% (00:30) wrong based on 71 sessions

HideShow timer Statistics

Math Expert
User avatar
V
Joined: 02 Sep 2009
Posts: 52390
Re M16-16  [#permalink]

Show Tags

New post 15 Sep 2014, 23:59
1
Intern
Intern
avatar
Joined: 29 Sep 2016
Posts: 16
Location: United States
Concentration: Finance, Economics
GPA: 3.01
Re: M16-16  [#permalink]

Show Tags

New post 06 Nov 2016, 14:44
1
Referencing The GMAT Club Math Book (pg.13)

To find the n of last digits of the product = product of n digits of the integers.

By looking at the answer choices, the answers very at the hundred digit places.
A = 866, B =956, C=856, D= 986, E = 996.

Thus we want to find the last 3 digits of the product in order to find the answer.

8988 * 12 = 10856. (note that it's not necessary for you to calculate beyond 856). Thus the only answer that contains 856 is C.
Intern
Intern
avatar
B
Joined: 27 Jan 2017
Posts: 30
Reviews Badge
Re: M16-16  [#permalink]

Show Tags

New post 09 Mar 2017, 07:24
2
I think the official answer here is the best way of looking at the problem.

When I first approached this question, however, I didn't notice that 8988 could be re-written as (9000-12).

I was still able to solve the question in under 1:30 seconds, though. I figured rather than trying to spend 30 seconds trying to think of a way to solve this, I could actually just multiply the two numbers quickly on paper. And quickly noticed I didn't have to solve the whole thing to find the answer.

8988
*
9012
------
17976
89880
000
0000
------
xx856

After adding the last two digits (76+80) I noticed the answer must end in 56. This eliminated everything but B and C. Then adding the last three digits 976+880+000 shows the answer must be 856.

I am not posting this because this is the most efficient way, but another way of looking at the problem because sometimes instead of losing precious time trying to find the easiest way to do something it might be quicker to just grind it out.
GMAT Club Bot
Re: M16-16 &nbs [#permalink] 09 Mar 2017, 07:24
Display posts from previous: Sort by

M16-16

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

Moderators: chetan2u, Bunuel



Copyright

GMAT Club MBA Forum Home| About| Terms and Conditions and Privacy Policy| GMAT Club Rules| Contact| Sitemap

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

Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.