math problem

[eyesfor21]

Here is a math trick it may stump you.

1. Grab a calculator. (you won't be able to do this one 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 number by 2

Do you recognize the answer?
Do you know why the it works?

 

[Shaggy18vw]

kinda neat (spoiler)

it multiplies the first three digits of your phone number by 10000 and adds the last four. The result is your phone number.

 

[Norm Wattenberger]

Or *LINK* *PIC*

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

 

[Shaggy18vw]

That's jsut how I did it on my TI-92+

 

[zengrifter]

Belongs at one of the ... *PIC*

... OTHER BOARDS! zg

 

[The Mayor]

Yes it does...