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Topic: The Number 9 (Read 1352 times) |
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Tons_of_fun
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Mmmm...Xena !
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The Number 9
« on: Nov 25th, 2007, 12:02am » |
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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 ? ? ?
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Lord...Sometimes im not that bright
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dan_the_man
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Re: The Number 9
« Reply #1 on: Nov 25th, 2007, 12:18am » |
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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
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Tons_of_fun
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Mmmm...Xena !
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Re: The Number 9
« Reply #2 on: Nov 25th, 2007, 12:34am » |
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Maybe we have un covered some secret alien code  or maybe the meaning of life isnt 42 at all...it,s 9  .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 
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ferretmobile
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Re: The Number 9
« Reply #4 on: Nov 26th, 2007, 4:51pm » |
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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.
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Baz
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S Reg. 1998 24v Cosworth S2.9 COS (Deceased)
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Re: The Number 9
« Reply #5 on: Nov 26th, 2007, 5:43pm » |
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Maths and fun in the same post?
I will have to think about that one!
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Jaye_Martin
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Re: The Number 9
« Reply #6 on: Nov 28th, 2007, 3:18pm » |
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I thought nine was german for No........I also thought Scorpio's were reliable xx
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Malcolm73
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Re: The Number 9
« Reply #7 on: Nov 28th, 2007, 5:42pm » |
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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.
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Tons_of_fun
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Re: The Number 9
« Reply #9 on: Nov 29th, 2007, 9:32am » |
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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 .Ta
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taliban aka Cheekyboy2
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Re: The Number 9
« Reply #10 on: Nov 29th, 2007, 11:52pm » |
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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.
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ferretmobile
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2.3 saloon S reg & all the toys. mmmm toys
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Re: The Number 9
« Reply #11 on: Dec 6th, 2007, 4:59pm » |
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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  
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gozz
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Re: The Number 9
« Reply #12 on: Dec 10th, 2007, 11:09pm » |
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Tappet adjusting on four cylinder engines,rule of 9,1and8 2and7 3and6 4and5!
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Jonnycab
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Re: The Number 9
« Reply #13 on: Dec 11th, 2007, 12:18am » |
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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 ..... 
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ferretmobile
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Re: The Number 9
« Reply #14 on: Dec 11th, 2007, 1:48pm » |
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To quote Homer Simpson...every time I learn something new, It pushes some old stuff out of my brain
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Tons_of_fun
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Mmmm...Xena !
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Re: The Number 9
« Reply #16 on: Dec 12th, 2007, 1:50am » |
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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 .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
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Lord...Sometimes im not that bright
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