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Kids maths homework help please :)

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Old 03 February 2009, 08:53 PM
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Midlife......
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Cool Kids maths homework help please :)
Just a quick question ...my 10 year old's homework tonight, here it is:

"I am a two-digit number between 10 and 40. I am the sum of all my divisors"

So what's the number ??

Cheers



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Old 03 February 2009, 08:59 PM
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Jamz3k
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err. i have no fooking clue cus i don't even know what it means

back to school for me
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Old 03 February 2009, 09:02 PM
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hamyam
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explain please
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Old 03 February 2009, 09:08 PM
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the only number that is equal to the sum of it's divisors is 1. every other number will be at least 1 greater i.e. 29 is divisible by 1 and 29 equaling 30 if you add them. so don't really get the question.
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Old 03 February 2009, 09:09 PM
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Ok I've started at 10 and worked my way up......I think I might have the answer

28 is divisible by 1, 2, 4, 7 and 14 so

1 + 2 + 4 + 7 + 14 = 28

so 28 is the answer AFAIK

No wonder it had my 10 year old baffled LOL

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Old 03 February 2009, 09:09 PM
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supa
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10 or 40
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Old 03 February 2009, 09:09 PM
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errrr..assuming you don't include 28 itself !!

Shaun
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Old 03 February 2009, 09:11 PM
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Luan Pra bang
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18

1+2+6+9

forgot the three definately 28
Last edited by Luan Pra bang; 03 February 2009 at 09:15 PM.
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Old 03 February 2009, 09:11 PM
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10 is divisible by 1, 2 and 5 which added together = 8

I'm sticking to 28 and if the teacher wants come round and dispute it she can LOL

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Old 03 February 2009, 09:12 PM
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It's 28. It should say you exclude the number itself as a divisor.

Perfect number - Wikipedia, the free encyclopedia
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Old 03 February 2009, 09:13 PM
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Gordo
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Bugger - just read the reply above - you said nothing about 'proper' dividers

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Last edited by Gordo; 03 February 2009 at 09:16 PM.
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Old 03 February 2009, 09:16 PM
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Luan Pra bang
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No its 28
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Old 03 February 2009, 09:17 PM
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divisors
Isn't that a town in Wiltshire?
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Old 03 February 2009, 09:29 PM
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LostUser

I had never heard of "Perfect Numbers"... sorted and cheers

I'll print out the first wiki page

Cheers

Shaun

PS would would scooby do....I think it means nicking the visors off bikers helmets...de-visors

I'll get my coat
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Old 03 February 2009, 10:13 PM
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to combat just this situation, the wife's new year resolution is to do her maths gcse again
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Old 04 February 2009, 01:12 AM
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Are you smarter than a ten year old.
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