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Neat little math trick?

Chris

Well-Known TRIBEr
at least it was neat to Mongo, please explain?

1. Grab a calculator. (you won't be able to do this in your head)
2. Key in the first three digits of your phone number (NOT the area code)
3. Multiply by 80
4. Add 1
5. Multiply by 250
6. Add the last 4 digits of your phone number.
7. Add the last 4 digits of your phone number again.
8. Subtract 250
9. Divide that number by 2.

....Do you recognize the answer???
 
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SJN

TRIBE Member
if i was still in 3rd year uni i could likely explain this....alas, my number theory is a bit rusty these days :(
 

Chris

Well-Known TRIBEr
Originally posted by Indian Girl
is this your way to get girls to fork their digits to you Mongo?


I know your sneaky ways!
just one of many I use to dazzle the ladies. They are like deers in head-lights, powerless!!!!
 
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zoo

TRIBE Member
it's not that crazy ..

putting the first 3 digits, then multiplying by 80 * 250 results in a multiplication by 20,000, so you're original numbers are now doubled and have 4 zeroes following them [phone # format]

you add 1 [which is multiplied by 250] so that you can subtract the 250 later to add to the 'witchery'

you put the last 4 digits twice because you must divide the entire thing by two in order to get the first 3 digits back to normal

woorhoo :rolleyes:
 

IgStar

TRIBE Member
I know this guy, let's call him Stuffin. And some days, he is like, like, reallly really funny and also, like um...sarcastic.

and he goes like, this

whyyyyyyyyyyyyyyyy meeeeeeeeeeeeeeeeeeeeeeeeee
 
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zoo

TRIBE Member
Originally posted by Klubmasta Will
3rd year university???

try grade 10 algebra. :p
what algebra?

don't you learn how to add, subtract, multiply, and divide by grade 5-6 ??
 

Chris

Well-Known TRIBEr
Originally posted by zoo
it's not that crazy ..

putting the first 3 digits, then multiplying by 80 * 250 results in a multiplication by 20,000, so you're original numbers are now doubled and have 4 zeroes following them [phone # format]

you add 1 [which is multiplied by 250] so that you can subtract the 250 later to add to the 'witchery'

you put the last 4 digits twice because you must divide the entire thing by two in order to get the first 3 digits back to normal

woorhoo :rolleyes:
Dude you totally blew one of my hooks!
 

silver1

TRIBE Member
Originally posted by Klubmasta Will
oooooh ... algebra.
Indeed. Nothing magical.

A phone # is 7 digits. So a number in the millions

Let x = the first 3 digits (i.e. a number between 000 - 999)
Let y = the last 4 digits (i.e. a number between 0000 - 9999)

(250(80x +1) + 2y - 250)/2
=(20000x + 2y)/2
= 10000x + y

10000 times a 3 digit number = a 7 digit number with the first 3 numbers being the first 3 in your phone number.

add the last 4 digits of your phone number.

Voila.

:p
 
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Klubmasta Will

TRIBE Member
Originally posted by zoo
what algebra?

don't you learn how to add, subtract, multiply, and divide by grade 5-6 ??
let x = the first three numbers, let y = the last 4 numbers.

then give a bunch of rules to result in 10000x + y (i.e. the phone number).
 

Casey

TRIBE Member
miltiply 250 by 80 and it = 20000 (this gives you 4 zeros)
add the last four digits of your phone number twice
devide by 2 to turn 20000 into 10000 and set the last four digits back

simple

FUCKING HELL

everyone beat me to it
 

SJN

TRIBE Member
Originally posted by Klubmasta Will
3rd year university???

try grade 10 algebra. :p
ya you're right....at first glance i thought this was more involved than it is.....there are trickier versions of this kind of thing that require number theory to solve
 
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