Maths Trick

26 Mar 2009

Here's a little maths trick which I was sent which is rather clever...It does require a calculator though...
1. Key in the first three digits of your home phone number (NOT the area code)
2 Multiply that number by 8
3. Add 1 to the total
4. Multiply the total by 250
5. Add to the total the last 3 digits of your phone number
6. Add the last 3 digits of your phone number to the total again.
7. Subtract 250 from the total
8. Finally Divide number by 2
Do you recognize the answer?
Just don't post the "answers" on here or you may end up with more than you bargained for... ;-)

26 Mar 2009

:shock:

26 Mar 2009

:shock:

26 Mar 2009

Only works on 6 digit phone numbers not on 7 digit numbers such as Birmingham/Manchester or 8 digits (London). :small-print:
Oh how sad, I actually tested it in Excel :doh:

26 Mar 2009

I dont get it. I've tried it 25000..ish times and end up with something i dont recognise. confused

: :?: :?: :?: :?:

26 Mar 2009

Weird!!

26 Mar 2009

OK i tried it for the 25001th time and it worked rolleyes

talk about dunce Lost ffs! biggrin

26 Mar 2009

:shock: my brain hurts lol

*in edit i followed the instructions all wrong....no wonder mine didnt make sense!!*

26 Mar 2009

it does not work if you have a zero as your 4th number lol as i do

26 Mar 2009

I have a seven digit phone number, but still thought it was quite clever so thanks. smile

26 Mar 2009

Quote by Sara_2006
it does not work if you have a zero as your 4th number lol as i do

no wonder mine made no sense when i did it 6 times on paper!!!

26 Mar 2009

Quote by Bonedigger
it does not work if you have a zero as your 4th number lol as i do

no wonder mine made no sense when i did it 6 times on paper!!!
Mine has a zero in, it worked when I did 0.?? although I got 2 extra 0's

26 Mar 2009

Quote by Sara_2006
it does not work if you have a zero as your 4th number lol as i do

It did for me.

26 Mar 2009

Quote by Freckledbird
it does not work if you have a zero as your 4th number lol as i do

It did for me.
Didn't work for me.....I guessed it was cos I have a zero as the 4th number dunno

26 Mar 2009

now....see how much better it works when u read ALL instructons properly AND use a calculator hehehehe!!
*note to self, do not try and attempt mental mayhs when kids want to regale you with the entire life history of the characters from one of the 'twilight' series of books!!!

26 Mar 2009

eeeeeeeee look at that....
cool

26 Mar 2009

Quote by Tan--Kinky
it does not work if you have a zero as your 4th number lol as i do

no wonder mine made no sense when i did it 6 times on paper!!!
Mine has a zero in, it worked when I did 0.?? although I got 2 extra 0's
That can't be right- you only get an oo with TYphoo. confused

26 Mar 2009

its -55 out confused

26 Mar 2009

Quote by poshkate
it does not work if you have a zero as your 4th number lol as i do

It did for me.
Didn't work for me.....I guessed it was cos I have a zero as the 4th number dunno

My fourth number is 0 lol

seems common

26 Mar 2009

ok i feel a right dunce lol didnt add the last 3 digits of number twice grrrrrrrrrrrrrrrrrrr am so mad at myself rolleyes

26 Mar 2009

Quote by Sara_2006
ok i feel a right dunce lol didnt add the last 3 digits of number twice grrrrrrrrrrrrrrrrrrr am so mad at myself

:doh: :doh::doh::doh:
me too!!!!

29 Mar 2009

Quote by Sara_2006
ok i feel a right dunce lol didnt add the last 3 digits of number twice grrrrrrrrrrrrrrrrrrr am so mad at myself

you n me both hun tried it 50 times or more before i noticed ya do it twice :silly:
note to self read instructions more carefully redface

29 Mar 2009

Couldn't believe it.
Rang the number and some fella answered!! wink

Lucky girl!!
.

30 Mar 2009

How oh how does someone discover that this works in the first place??????

30 Mar 2009

Quote by bouncy332
ok i feel a right dunce lol didnt add the last 3 digits of number twice grrrrrrrrrrrrrrrrrrr am so mad at myself

you n me both hun tried it 50 times or more before i noticed ya do it twice :silly:
note to self read instructions more carefully redface

ops: I didn't either :oops: :lol2:

30 Mar 2009

Quote by jumptoit
How oh how does someone discover that this works in the first place??????

Quite easily. It's basic maths, just lots of useless expansions adding steps.
Put it like this, it's doing. (where x is first 3 digits of phone number, y is last 3 digits)
x*1000+y
((x*8)*250+(y*2))/2 (this expansion multiples by 2000, so everything needs to be divided by 2 at the end obviously)
(((x*8)+1)*250+(y+y)-250)/2
yada yada. lol
Feel free to modify the constants, for example:
(((x*5)+1)*400+(y+y)-400)/2
or
(((x*16)+1)*250+(y+y+y+y)-250)/4
No matter what you do, it's just a complicated way of multiplying one number by 1000 and then adding another one onto it. lol

30 Mar 2009

Quote by Sixfootsix
How oh how does someone discover that this works in the first place??????

Quite easily. It's basic maths, just lots of useless expansions adding steps.
Put it like this, it's doing. (where x is first 3 digits of phone number, y is last 3 digits)
x*1000+y
((x*8)*250+(y*2))/2 (this expansion multiples by 2000, so everything needs to be divided by 2 at the end obviously)
(((x*8)+1)*250+(y+y)-250)/2
yada yada. lol
Feel free to modify the constants, for example:
(((x*5)+1)*400+(y+y)-400)/2
or
(((x*16)+1)*250+(y+y+y+y)-250)/4
No matter what you do, it's just a complicated way of multiplying one number by 1000 and then adding another one onto it. lol
Thank you worship

:worship: :worship:
I hate not being able to see the trick.

30 Mar 2009

Quote by Sixfootsix
How oh how does someone discover that this works in the first place??????

Quite easily.
... but you still have to follow the instructions confused

30 Mar 2009

I haven't done this yet... but will it mean I'll have all your 'phone numbers?
lp

4 Apr 2009

Quote by Sara_2006
ok i feel a right dunce lol didnt add the last 3 digits of number twice grrrrrrrrrrrrrrrrrrr am so mad at myself

Fell foul of the same point. :roll: Need to read carefully in future. Nice trick though. The explaination above makes my brain cell ache but at least it understands it.