1. Grab your calculator (You won't be able to do this one in your head)

2. Key in the first 3 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

10. Do you recognize the answer?

Vicky

must only work in America either that or the windows calculator has disagreed with me once more!. Hehe

I can see the last few digits are the same but that's it.

It should work with phone numbers that are of the form abc-wxyz. If you call the value "x" the "abc" from the phone number, and the value "y" the wxyz from the phone number, the problem comes out like this:

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

(20000x + 250 + 2y - 250)/2 =

10000x + 125 + y - 125 =

10000x + y

Thus, if your phone number is 555-1212, then the number you get will be 5550000 + 1212 = 5551212, your original phone number.

Originally posted by Gav240z

must only work in America either that or the windows calculator has disagreed with me once more!. Hehe

I can see the last few digits are the same but that's it.

Learned that one in High School. (Many, many years ago!) Try it again. It works with any 7 number combination.

Our phone numbers are 8 digits...!