Mobile Number maths!

xern

This might be in the wrong Forum, if so. mods move it at your leisure!!


1) Key-in the first 3 digits of your mobile phone number into the
calculator (not 085/6/7)
2) Multiply by 80
3) Add 1
4) Multiply by 250
5) Plus last four digit of phone number
6) Plus last four digit of phone number again
7) Minus 250
8) Divide by 2

> > > Is it your phone number? > > >

Sposs

do you know that most calulators will not let you key in 0 as a first number.

tman

OMFG LOOL
HOEW DID U DOE DAT???? LOL LOL
DAT IS SO FKN KEWL!!!!?!?!?!?!!
ROFLFLFLFLFLFLFLLFLFC

midget lord

it worked for me too, pretty cool alright.

I wouldnt say its kewl, because thats just an incorrect spelling and i dont know of any calculators that will let you put in 0 as the first number unless you put a decimal directly after it.

damnyanks

!!!!

Who told you that ?

technobob

Originally posted by xern
not 085/6/7)

most numbers after the operator code dont start with 0

none that i know of anyway

woosaysdan

cool trick watch til someone will ruin it with the answer on how it works out of spite

Asok

Thats pretty nifty

technobob

well seen as you input your 7 digit number into the equation im sure there is a very simple basic mathemathical explantion with which to get your number back out again

Winters

fancy stuff there.

didnt work the first time but i got it on the second

Jim

by accident i typed in the first three digits of my operator number, thing it tells you not to do.

i ended up getting my number back minus the first number of my mob number. how odd.

woosaysdan

Originally posted by technobob
well seen as you input your 7 digit number into the equation im sure there is a very simple basic mathemathical explantion with which to get your number back out again

see what i mean its started already!!!

Beëlzebooze

spoiler:

number * 80 * 250 = number * 20000

(double number and add 4 positions)

to make it look less obvious add one, and have that multiplied by the 250 aswell, subtract the 250 later

add the last 4 digits twice, and divide by two.

dod

Sorry woosaysdan, this had to be written (same as Beezlebooze above, but worked through line by line)

Your phone number is a 7 digit sequence 08n-ABCDEFG

Additively, this could be expressed as
(10^6)A + (10^5)B + (10^4)C + (10^3)D + (10^2)E + 10F +G

The first three digits as a number gives
10^2A + 10B + C

Multiply by 80 gives
10^2(80A) + 10(80B) + 80C

Add 1gives
1+ (10^2(80A) + 10(80B) + 80C)

Multiply by 250:

The 250 multiplied by the 80 gives 20000 = 2*10^4

This gives:
250 + 10^6(2A) + 10^5(2B) + 10^4(2C)

Add the last four digits of your number
250 + 10^6(2A) + 10^5(2B) + 10^4(2C) + (10^3)D + (10^2)E + 10F +G

Add the last four digits of your number again
250 + (10^6)2A + (10^5)2B + (10^4)2C + (10^3)2D + (10^2)2E + 10(2)F +2G

Subtract 250
(10^6)2A + (10^5)2B + (10^4)2C + (10^3)2D + (10^2)2E + 10(2)F +2G

Divide by 2
(10^6)A + (10^5)B + (10^4)C + (10^3)D + (10^2)E + 10F +G

- gives the same number as you started with: ABCDEFG

woosaysdan

why cant people just admire this for what it is and stop tring to solve with the mathemathical explantions it takes all the fun out of it!!!

Peace

its nifty but i presume its just a breakdown of an algoritm vodafone use to generate new phone numbers.....

dod

Originally posted by Peace
its nifty but i presume its just a breakdown of an algoritm vodafone use to generate new phone numbers.....

Did you bother to read the spoilers?

Natural Born Techie.
Never been a newbie.

The tech industry is doomed.

Mossy Monk

didnt work for me

Creamy Goodness

Originally posted by woosaysdan
why cant people just admire this for what it is and stop tring to solve with the mathemathical explantions it takes all the fun out of it!!!

people like solving these type of questions and so not to spoil the fun they stick in in spoiler form so that you don't have to read it

Peace

Originally posted by dod
Did you bother to read the spoilers?



The tech industry is doomed.

if it didn't know better i would think you were trying to insult me.

dod

Originally posted by Peace
if it didn't know better i would think you were trying to insult me.

No offence intended I assure you.

ixoy

Originally posted by Beëlzebooze
spoiler:

number * 80 * 250 = number * 20000

(double number and add 4 positions)

to make it look less obvious add one, and have that multiplied by the 250 aswell, subtract the 250 later

add the last 4 digits twice, and divide by two.

... glad to see I wasn't the only pedantic bastard who felt obliged to solve it moments after seeing it

Agent Smith

how very odd.....


worked it out my number is 08X-XXXXX65


and i got


08X-XXXX69






fubar or what?




have done this 3 times has my friend did it and Bang out by 4...





( do i win some sort of prize?)

Gordon

Yes agent smith, the thing is - you have made it impossible for anyone to call you now. Sorry.

Imposter

Didn't work for me. Then again my number does have 8 digits in it!

ferdi

didnt work for me.

as for the pople who worked it out with the math equations, you are sad anal creatures.

Kone

Originally posted by dod
Did you bother to read the spoilers?



The tech industry is doomed.

ROFL

xern

I really didn't think it would get this much of a reaction!!!
fair play to all of you that worked out the equation, you have to much time on your hands!!!

hussey

Originally posted by technobob
most numbers after the operator code dont start with 0

none that i know of anyway

Mine does

086-08438XX

it worked for me well it gave back 8438XX

HarryD

Think of any number between 0 and 10,500
add 1
subtract 1

You end up with your original number ?

Amazing !