Here is a math trick so unbelievable that it will 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?

That was really cool! Thanks!!!

Yup it works
weird

Didn't work for me. My phone # has 8 digits; maybe that's why?

Hrmm...perhaps. I think this math problem only works for those with 7 digits. Sorry :(

(((250(80(a)+1))+2b)-250)/2

a= first three digits
b= second four digits

Hrmm...perhaps. I think this math problem only works for those with 7 digits. Sorry :(
No. :eek: works with more than 7 digits:eek:

that was really cool

Website will soon do this automatically, give me a few minutes.

(PS I love wireless internet...taking notes on laptop while programming and playing online WOOO)

Here is a math trick so unbelievable that it will stump you.
1. Grab a calculator. (you won't be able to do this one in your head)



Oh PPS: I did it in my head...well, I used a paper for some figuring. :) Reducing! Oh...and I'm good with numbers. Hehe

Andrew that is really cool ...my own phone number in the calculator.

so cool!!

Cool.
P = first three digits and S = last four

((250(80P + 1) + 2S) - 250) / 2

Which is: (20000P + 250 + 2S - 250) / 2 = 10000P + S (P <<_10 4 OR S in my own notation...)

Whoever made the trick probably took that and factored out some numbers, working backwards.

As can be seen, the number of digits of P is arbitrary, while S is limited to four digits.

It didn't work for me my number has 8 digits how many is there in America?

It didn't work for me my number has 8 digits how many is there in America?

You have to use the first four digits for step 1. Example (12345678):

1234 * 80 = 98720
(98720 + 1) * 250 = 24680250
24680250 + 5678 + 5678 = 24691606
(24691606 - 250) / 2 = 12345678