Just for fun ...

Here's a math problem:

1. Grab a calculator. (You won't be able to do this in your head unless you're a math whiz.)
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 the number by 2.

Do you recognize the answer?