Hmm....

As a former math teacher, I love things like this.

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

2. Key in the first three digits of your phone number (NOT the area
code).

3. Multiply by 80.

4. Add one.

5. Multiply by 250.

6. Add the last four numbers of your phone number.

7. Add the last four numbers of your phone number again.

8. Subtract 250.

9. Divide by two.

Do you recognize the answer?