Here is a math trick so unbelievable that it will stump you. Grab a calculator (you won't be able to do this one in your head) Make sure you hit the enter key after every step.
1. Key in the first three digits of your phone
number (NOT the area code)
2. Multiply by 80
3. Add 1
4. Multiply by 250
5. Add to this the last four digits of your
phone number.
6. Add to this the last four digits of your
phone number again.
7. Subtract 250
8. Divide number by 2
9. DOES THIS NUMBER LOOK FAMILIAR???
(Answer: Should be your phone number minus the
area code, if you don't get this you did something wrong)