Check GMAT Club Decision Tracker for the Latest School Decision Releases https://gmatclub.com/AppTrack
GMAT Club

 It is currently 25 Mar 2017, 01:08

### 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

# What is the least number of digits (including repetitions) needed to e

Author Message
TAGS:

### Hide Tags

Intern
Joined: 08 Aug 2009
Posts: 21
Followers: 0

Kudos [?]: 15 [0], given: 0

What is the least number of digits (including repetitions) needed to e [#permalink]

### Show Tags

02 Dec 2009, 08:19
5
This post was
BOOKMARKED
00:00

Difficulty:

25% (medium)

Question Stats:

68% (01:40) correct 32% (00:59) wrong based on 159 sessions

### HideShow timer Statistics

What is the least number of digits (including repetitions) needed to express 10^100 in decimal notation?

a) 4
b) 100
c) 101
d) 1000
e) 1001
[Reveal] Spoiler: OA
Manager
Joined: 19 Nov 2007
Posts: 225
Followers: 1

Kudos [?]: 269 [0], given: 1

Re: What is the least number of digits (including repetitions) needed to e [#permalink]

### Show Tags

02 Dec 2009, 09:02
10^n is a decimal number with a 1 followed by n zeros.
So 10^100 will include 100 0's + 1 digit for 1 = 101
Intern
Joined: 31 Oct 2009
Posts: 38
Followers: 1

Kudos [?]: 54 [5] , given: 0

Re: What is the least number of digits (including repetitions) needed to e [#permalink]

### Show Tags

02 Dec 2009, 13:59
5
KUDOS
1
This post was
BOOKMARKED
This can easily be solved by looking at patterns of 10:

$$10^1=2 digits$$
$$10^2=3 digits$$
$$10^3=4 digits$$
$$10^4=5 digits$$
...so...
$$10^n=n+1 digits$$

thus:
$$10^{100}=101 digits$$
Intern
Joined: 11 Nov 2009
Posts: 10
Followers: 0

Kudos [?]: 1 [0], given: 1

Re: What is the least number of digits (including repetitions) needed to e [#permalink]

### Show Tags

02 Dec 2009, 14:32
10^2 is 1 followed by 2 zeroes in decimal notation

10^3 is 1 followed by 3 zeroes in decimal notation

10^4 is 1 followed by 4 zeroes in decimal notation

Hence 10^100 is 1 followed by 100 zeroes in decimal notation

Number of digits is 1 + 100 zeroes and hence answer C.
Intern
Joined: 08 Aug 2009
Posts: 21
Followers: 0

Kudos [?]: 15 [0], given: 0

Re: What is the least number of digits (including repetitions) needed to e [#permalink]

### Show Tags

03 Dec 2009, 05:26
Thanks guys. OA is indeed C.
GMAT Club Legend
Joined: 09 Sep 2013
Posts: 14402
Followers: 604

Kudos [?]: 174 [0], given: 0

Re: What is the least number of digits (including repetitions) needed to e [#permalink]

### Show Tags

26 Jan 2015, 17:07
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.
_________________
Veritas Prep GMAT Instructor
Joined: 16 Oct 2010
Posts: 7246
Location: Pune, India
Followers: 2203

Kudos [?]: 14325 [1] , given: 222

Re: What is the least number of digits (including repetitions) needed to e [#permalink]

### Show Tags

26 Jan 2015, 22:10
1
KUDOS
Expert's post
wolver123 wrote:
What is the least number of digits (including repetitions) needed to express 10^100 in decimal notation?

a) 4
b) 100
c) 101
d) 1000
e) 1001

I am guessing what put you off the question was "in decimal notation". It just means using the decimal system of counting (with 10 digits 0 - 9) as opposed to other systems such as binary (using only two digits 0 and 1) etc. Decimal notation is the usual system we use to write numbers. It has nothing to do with the decimal point.
_________________

Karishma
Veritas Prep | GMAT Instructor
My Blog

Get started with Veritas Prep GMAT On Demand for \$199

Veritas Prep Reviews

GMAT Club Legend
Joined: 09 Sep 2013
Posts: 14402
Followers: 604

Kudos [?]: 174 [0], given: 0

Re: What is the least number of digits (including repetitions) needed to e [#permalink]

### Show Tags

19 Apr 2016, 00:14
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.
_________________
Intern
Joined: 28 Sep 2016
Posts: 1
Followers: 0

Kudos [?]: 0 [0], given: 12

What is the least number of digits (including repetitions) needed to e [#permalink]

### Show Tags

28 Sep 2016, 11:07
10^(-1)×10^101= 10^100
Can also be written in decimal notation as 0.1×10^101 = 10^100
What is the least number of digits (including repetitions) needed to e   [#permalink] 28 Sep 2016, 11:07
Similar topics Replies Last post
Similar
Topics:
2 How many three digit numbers contain the digit 5 at least once? 5 14 Nov 2016, 03:45
19 In the table above, what is the least number of table entrie 13 24 Jan 2014, 03:51
12 In the table above what is the least number of table entries 6 15 Mar 2012, 19:59
3 271. How many 3-digit numbers begin with a prime digit and e 6 11 Mar 2011, 12:53
63 A telephone number contains 10 digit, including a 3-digit 21 05 Feb 2008, 22:26
Display posts from previous: Sort by