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# 1)How do we factor a negative number? for example -24 is:

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Intern
Joined: 20 Dec 2005
Posts: 20
1)How do we factor a negative number? for example -24 is: [#permalink]

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23 Jan 2006, 08:49
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

1)How do we factor a negative number?
for example -24 is: 2x2x2x3x(-1) ??

2)Is -3 a multiple of 3? Is -12 a multiple of 3? Is zero a multiple of 3 ?(since 0:3=0 which is an integer)

3)When looking for the divisors of a positive number we should look for negative numbers too? (if the question doesn't state oherwise). For example if the question is how many are the divisors of 12, we should anwser 6: (1,2,3,4,6,12) or the correct answer is 12? (-1,-2,-3,-4,-6,
-12,1,2,3,4,6,12).

thanks everybody!
VP
Joined: 20 Sep 2005
Posts: 1017

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23 Jan 2006, 13:39
I saw a problem ( I think it was ETS ) that calculated 0 as a multiple of 5 since 5*0 = 0.

ps_dahiya wrote:
eleni24 wrote:
1)How do we factor a negative number?
for example -24 is: 2x2x2x3x(-1) ??

Factorize the number and one of all the factors is -ve.

2)Is -3 a multiple of 3? Is -12 a multiple of 3? Is zero a multiple of 3 ?(since 0:3=0 which is an integer)

"-3 a multiple of 3" is true. But "Is zero a multiple of 3" is false.

3)When looking for the divisors of a positive number we should look for negative numbers too? (if the question doesn't state oherwise). For example if the question is how many are the divisors of 12, we should anwser 6: (1,2,3,4,6,12) or the correct answer is 12? (-1,-2,-3,-4,-6,
-12,1,2,3,4,6,12).

This depends on the question. I have never encountered a question where it asks to find the -ve factors also.

thanks everybody!
Senior Manager
Joined: 11 Jan 2006
Posts: 269
Location: Chennai,India

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23 Jan 2006, 23:23
ps_dahiya wrote:
eleni24 wrote:
1)How do we factor a negative number?
for example -24 is: 2x2x2x3x(-1) ??

Factorize the number and one of all the factors is -ve.

2)Is -3 a multiple of 3? Is -12 a multiple of 3? Is zero a multiple of 3 ?(since 0:3=0 which is an integer)

"-3 a multiple of 3" is true. But "Is zero a multiple of 3" is false.

3)When looking for the divisors of a positive number we should look for negative numbers too? (if the question doesn't state oherwise). For example if the question is how many are the divisors of 12, we should anwser 6: (1,2,3,4,6,12) or the correct answer is 12? (-1,-2,-3,-4,-6,
-12,1,2,3,4,6,12).

This depends on the question. I have never encountered a question where it asks to find the -ve factors also.

thanks everybody!

dhayia , I think ) is a multiple , coz 0 with any number - +ve , -ve gives a valure 0...
_________________

vazlkaiye porkalam vazltuthan parkanum.... porkalam maralam porkalthan maruma

Director
Joined: 04 Oct 2005
Posts: 582
Location: Chicago

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24 Jan 2006, 00:01
well 0 is a multiple..i remeber doing atleast 405 questions wrong with not considering 0 as multiple..Hence its in my error log
CEO
Joined: 20 Nov 2005
Posts: 2894
Schools: Completed at SAID BUSINESS SCHOOL, OXFORD - Class of 2008

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24 Jan 2006, 00:07
Thanks guys. I will keep this in my mind.
_________________

SAID BUSINESS SCHOOL, OXFORD - MBA CLASS OF 2008

Intern
Joined: 20 Dec 2005
Posts: 20

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24 Jan 2006, 12:54
ps_dahiya wrote:
eleni24 wrote:
1)How do we factor a negative number?
for example -24 is: 2x2x2x3x(-1) ??

Factorize the number and one of all the factors is -ve.

2)Is -3 a multiple of 3? Is -12 a multiple of 3? Is zero a multiple of 3 ?(since 0:3=0 which is an integer)

"-3 a multiple of 3" is true. But "Is zero a multiple of 3" is false.

1)yes, but how can a factor be negative? The theory says that PRIME factors can never be negative...

2)What about -12? is a multiple of 3, too? Or we start from -3?
If we should count negative multiples too, then if a question asks to find all the multiples of 3 up to 300, we should answer that they are infinite...
Re: some questions...   [#permalink] 24 Jan 2006, 12:54
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