BREAKING: Target Test Prep releases Brand New 2026 On Demand GMAT prep course

Redeem
TTP OnDemand GMAT Video Course
Featured Course

Target Test Prep GMAT OnDemand

Scott Woodbury-Stewart’s private virtual classroom — 400 hours of master-class video lessons for the GMAT Focus Edition.

  • 715+ score guarantee — highest in the industry (99th percentile)
  • 52 chapters · 1,500+ lessons · 4,000+ practice questions
  • 400 hours of video · 1,500+ instructor-led HD smartboard lessons
  • 300,000+ students accepted to Harvard, Stanford, Wharton, Booth & Sloan & more
  • 24/7 live support + weekly Zoom office hours with GMAT instructors
  • TTP AI Assist — 24/7 AI-powered virtual tutor for instant help
  • 1,200+ flashcards + AI-powered study assistant & daily calendar
  • OnDemand, LiveTeach & GMAT Bootcamp formats available
  • Also: GRE, SAT Math & Executive Assessment courses
  • MBA Admissions Consulting now available
  • 🏆 2025 EdTech Breakthrough Award: Test Prep Solution Provider of the Year
  • 200,000+ students served
  • 5-day free trial — $0 to start, no auto-billing, cancel anytime
★★★★★ 5.0 (559 reviews)
130-pt guarantee
$0 to start then $127/mo
Start Free 5-Day Trial Read 559 Reviews →

Integers

Expert replies
Post new topic Post Reply
Previous Topic Next Topic
Source: — Problem Solving |
Legendary Member
Posts: 541
Joined: Thu May 31, 2007 6:44 pmFollowed by: 3 members
Location: UK
Thanked: 21 times
GMAT Score:680

by rohangupta83 » Mon Nov 24, 2008 11:55 am
imo E

basically the tens digit = 1
units digit = 3

i.e. the number should be - - - - 13

every one hundred digits have only one number which has tens digit 1 and units digit 3

therefore

458600 - 324700 = 133900

133900/100 = 1339 (as every one hundred digits have only one number which has tens digit 1 and units digit 3)
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Master | Next Rank: 500 Posts
Posts: 458
Joined: Sun Aug 31, 2008 10:44 amFollowed by: 1 member
Thanked: 3 times

by gmat009 » Mon Nov 24, 2008 12:02 pm
rohangupta83 wrote:imo E

every one hundred digits have only one number which has tens digit 1 and units digit 3
CAn you plz. explain this step..........


Thanks
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Senior | Next Rank: 100 Posts
Posts: 47
Joined: Wed Oct 08, 2008 11:29 am
Location: Toronto, Ontario
Thanked: 5 times

by anayeri » Mon Nov 24, 2008 12:04 pm
You want to basically count how many numbers have 13 at the end, between 324,700 and 458,600.

- Let's ignore 324,700-324,999 and 458,001-458,600 to start, and just say: "try and find how many 13's there are between 325,000 and 458,000."

- You know that each thousand number has 10 of them (ie 325,013; 325,113; 325,213....325,913 etc).
- You also know that there are 133 "thousands" between 325,000 and 458,000
- so if each of these "thousands" has 10 "13s", then we have a total of 1,330 "13's".
- but remember, we have to add the few we ignored at first: so there are 3 "13's going from 324,700-324,999 [ie 324,713; 324,813; 324,913] and 6 of them going from 458,000 to 458,600, for a total of 9.

So, 1330 + 9 = 1339.

Hope that helps.
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Master | Next Rank: 500 Posts
Posts: 458
Joined: Sun Aug 31, 2008 10:44 amFollowed by: 1 member
Thanked: 3 times

by gmat009 » Mon Nov 24, 2008 12:34 pm
anayeri wrote:You want to basically count how many numbers have 13 at the end, between 324,700 and 458,600.

- Let's ignore 324,700-324,999 and 458,001-458,600 to start, and just say: "try and find how many 13's there are between 325,000 and 458,000."

- You know that each thousand number has 10 of them (ie 325,013; 325,113; 325,213....325,913 etc).
- You also know that there are 133 "thousands" between 325,000 and 458,000
- so if each of these "thousands" has 10 "13s", then we have a total of 1,330 "13's".
- but remember, we have to add the few we ignored at first: so there are 3 "13's going from 324,700-324,999 [ie 324,713; 324,813; 324,913] and 6 of them going from 458,000 to 458,600, for a total of 9.

So, 1330 + 9 = 1339.

Hope that helps.
Very clear.......
Thanks
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Post new topic Post Reply
• Page 1 of 1