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        General >> Off Topic Subjects >> The Number 9
        
(Message started by: Tons_of_fun on Nov 25^th, 2007, 12:02am)

Title: The Number 9
Post by Tons_of_fun on Nov 25^th, 2007, 12:02am

This little nugget has had me pondering all day.When helping my 4 y/o with his 9 times table i noticed that all the answers added up to 9 ! For example...2x9= 18 (1+8=9) 3x9=27 (2+7=9) 4x9=36 (3+6=9) 5x9=45 (4+5=9) 6x9=54 (5+4=9),and so on until you get to 99 then it starts all over again.Anyone else noticed this or is it time to lay off the home brew ? ? ?

Title: Re: The Number 9
Post by dan_the_man on Nov 25^th, 2007, 12:18am

the answers also go up and down one digit at a time from 18 . 1 and 8 , 2 and 7 , 3 and 6 , 4 and 5 , 5 and 4 , 6 and 3 , ect

Title: Re: The Number 9
Post by Tons_of_fun on Nov 25^th, 2007, 12:34am

Maybe we have un covered some secret alien code ::) or maybe the meaning of life isnt 42 at all...it,s 9 :o :o :o.The most worrying thing is ...A 4 year olds maths homework has got 2 of us thinking about it at 12.30 in the morning.Definatly need to lay off the home brew i think ;D ;D ;D

Title: Re: The Number 9
Post by Kjetil S on Nov 25^th, 2007, 1:48pm

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Title: Re: The Number 9
Post by ferretmobile on Nov 26^th, 2007, 4:51pm

They are known as magic numbers, you can also have them in cubes where some of the numbers are missing and it is fun trying to work out the missing digits. ::)

Title: Re: The Number 9
Post by Baz on Nov 26^th, 2007, 5:43pm

Maths and fun in the same post?

I will have to think about that one!

Title: Re: The Number 9
Post by Jaye_Martin on Nov 28^th, 2007, 3:18pm

I thought nine was german for No........I also thought Scorpio's were reliable xx

Title: Re: The Number 9
Post by Malcolm73 on Nov 28^th, 2007, 5:42pm

The sum of the digits of any number when added together produce a second number. If the second number is divisible by nine then the original number is also divisible by nine

As an example, the sum of the digits 123,456,789 (45) is divisible by nine and in turn 45 is also divisible by nine. The year 2007 is also divisible by nine.

Cats also have nine lives except when attached to a Scorpio when they have just one.

Title: Re: The Number 9
Post by Kjetil S on Nov 29^th, 2007, 2:00am

on 11/28/07 at 17:42:05, Malcolm73 wrote:

Cats also have nine lives except when attached to a Scorpio when they have just one.

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Title: Re: The Number 9
Post by Tons_of_fun on Nov 29^th, 2007, 9:32am

Thank you malcom.Was wondering if there is an actual name for numbers like this as believe it or not ,my sons teatcher dosent know,neither does any of my wifes university friends or tutors :o.Ta

Title: Re: The Number 9
Post by taliban aka Cheekyboy2 on Nov 29^th, 2007, 11:52pm

ferret, its not, its not fun at all, drinking beer is fun, watching live bands is fun, cheering on your team is fun, watching final score and seeing that chelski have lost is fun, owning a scorpio that works is fun, albeit short lived ::),
but trust me on this;
trying to make digits fit in 'their' cubes is definately not fun.

Title: Re: The Number 9
Post by ferretmobile on Dec 6^th, 2007, 4:59pm

Probably due to the fact that I am a prevert ;)

Oh, did I forget to mention that I married Carol Vorderman...........trust me on this one, numbers are fun }{ :-X

Title: Re: The Number 9
Post by gozz on Dec 10^th, 2007, 11:09pm

Tappet adjusting on four cylinder engines,rule of 9,1and8 2and7 3and6 4and5!

Title: Re: The Number 9
Post by jonnycab on Dec 11^th, 2007, 12:18am

I may have found the answer for which you all seek ;)

I have vague recollections of this from my school years, but had to look it up again ;)

The reason 9 has these unique mathematical properties is because we predominantly work in base 10 & it is the last number before ten.

If we worked in base 9 then the last number before it is obviously 8. If you multiply 8 by any number...i.e...3 x 8 in base 9 = 26, 5 x 8 in base 9 = 44, then it works in the same way as 9 does in base 10, in that all the answers add up to 8.

You can work it out here......http://www.cleavebooks.co.uk/scol/calnumba.htm

It is the same in all number bases....for example...put a number in the base 10 box...say 12 (2x6) & look up the answer in base 7...it is 15 which adds up to 6, put 12 (3x4) in the base 10 box & the answer in base 5 is 22 which adds up to 4 :)

.....I can't carry on anymore as my 40 year old brain has now reached it's max load & has reverted back to "who needs that kind of knowledge to survive anyway" mode ::)

P.S....If there are any 12 year olds reading this thinking.... "duh"...... it's not that we don't know, it's just that we've forgotton ;)..... :P

Title: Re: The Number 9
Post by ferretmobile on Dec 11^th, 2007, 1:48pm

To quote Homer Simpson...every time I learn something new, It pushes some old stuff out of my brain ::)

Title: Re: The Number 9
Post by taliban aka Cheekyboy2 on Dec 11^th, 2007, 6:04pm

very true gozz

Title: Re: The Number 9
Post by Tons_of_fun on Dec 12^th, 2007, 1:50am

Thanks for that JC.I too am now completley baffled ???.Just think all this came about because of my 4y/o (5 on the 28th) was learning his 9 x table & spotted this :o.He,s being enrolled in a school for the gifted & talented next sept as his current school cant keep up.Lets hope his new teatchers can answer his questions better than me eh!If pride is a sin,then im the BIGGEST sinner out there ;D ;D