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1)How do we factor a negative number? for example -24 is: [#permalink]
23 Jan 2006, 07:49

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).

Re: some questions... [#permalink]
23 Jan 2006, 12:39

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.

Re: some questions... [#permalink]
23 Jan 2006, 22:23

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...
_________________

Re: some questions... [#permalink]
24 Jan 2006, 11:54

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...

gmatclubot

Re: some questions...
[#permalink]
24 Jan 2006, 11:54