Find all School-related info fast with the new School-Specific MBA Forum

 It is currently 13 Oct 2015, 06:54

### 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 June
Open Detailed Calendar

# Multiples

Author Message
TAGS:
Director
Status: No dream is too large, no dreamer is too small
Joined: 14 Jul 2010
Posts: 650
Followers: 37

Kudos [?]: 461 [0], given: 39

Multiples [#permalink]  12 Aug 2010, 08:27
00:00

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 100% (00:16) wrong based on 1 sessions
How many multiples of 10 are there between 1000 and 2000, inclusive?

Let me to know the calculation process.
Ans.101
_________________

Collections:-
PSof OG solved by GC members: http://gmatclub.com/forum/collection-ps-with-solution-from-gmatclub-110005.html
DS of OG solved by GC members: http://gmatclub.com/forum/collection-ds-with-solution-from-gmatclub-110004.html
100 GMAT PREP Quantitative collection http://gmatclub.com/forum/gmat-prep-problem-collections-114358.html
Collections of work/rate problems with solutions http://gmatclub.com/forum/collections-of-work-rate-problem-with-solutions-118919.html
Mixture problems in a file with best solutions: http://gmatclub.com/forum/mixture-problems-with-best-and-easy-solutions-all-together-124644.html

Math Expert
Joined: 02 Sep 2009
Posts: 29852
Followers: 4921

Kudos [?]: 53941 [0], given: 8257

Re: Multiples [#permalink]  12 Aug 2010, 08:44
Expert's post
Baten80 wrote:
How many multiples of 10 are there between 1000 and 2000, inclusive?

Let me to know the calculation process.
Ans.101

Hi, and welcome to Gmat Club! Below is a solution for your problem:

$$# \ of \ multiples \ of \ x \ in \ the \ range = \frac{Last \ multiple \ of \ x \ in \ the \ range \ - \ First \ multiple \ of \ x \ in \ the \ range}{x}+1$$.

For our original question we would have: $$\frac{2,000-1,000}{10}+1=101$$.

Check this: totally-basic-94862.html?hilit=last%20first%20range%20multiple

Hope it helps.
_________________
Senior Manager
Status: Time to step up the tempo
Joined: 24 Jun 2010
Posts: 408
Location: Milky way
Schools: ISB, Tepper - CMU, Chicago Booth, LSB
Followers: 8

Kudos [?]: 152 [0], given: 50

Re: Multiples [#permalink]  12 Aug 2010, 08:47
My attempt:

1000 - 1100 -- 11
1110 - 1200 -- 10
1210 - 1300 -- 10

1X10 - 1(X+1)00 -- 10

X - 3, 4, 5, 6 ,7 ,8, 9.

Sum them up - 101.
_________________

Support GMAT Club by putting a GMAT Club badge on your blog

Senior Manager
Status: Fighting on
Joined: 14 Mar 2010
Posts: 318
Schools: UCLA (R1 interview-WL), UNC(R2--interview-ding) Oxford(R2-Admit), Kelley (R2- Admit ), McCombs(R2)
WE 1: SE - 1
WE 2: Engineer - 3
Followers: 4

Kudos [?]: 24 [0], given: 3

Re: Multiples [#permalink]  12 Aug 2010, 10:27
In general the formula for any series where "d" is the increment or difference between two terms to find the nth term =
An= A1+ (n-1)d
Now we know An =2000
A1=1000
d=10
2000=1000+(n-1)10
=101

OR
Use this
( last -first )/ increment + 1

Posted from my mobile device
GRE Forum Moderator
Affiliations: PMP certified, IT professional
Joined: 21 Jun 2010
Posts: 217
Location: USA
Schools: CMU, Kelley
Followers: 9

Kudos [?]: 111 [0], given: 2

Re: Multiples [#permalink]  14 Aug 2010, 08:44
As already discussed, the method is [(Last-First)/Increment ]+1

If you are refering to mgmat by any chance, this is discussed in Chap4 of Number properties
Re: Multiples   [#permalink] 14 Aug 2010, 08:44
Similar topics Replies Last post
Similar
Topics:
P is not a multiple of ? 3 09 Jul 2011, 18:44
Multiplication the only way? 4 14 Dec 2010, 17:18
Formula for finding multiples 3 23 Jul 2010, 05:43
GMAT Prep - Multiples 2 05 Feb 2010, 12:18
Multiple and factors defnied 3 26 Jan 2010, 08:16
Display posts from previous: Sort by