GRAB A CALCULATOR

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 -- example: 555-976-5555 -- you'd use "976"
3. Multiply by 80
4. Add 1
5. Multiply by 250
6. Add the last 4 digits of your phone number (e.g. 5349)
7. Add the last 4 digits of your phone number again
8. Subtract 250
9. Divide number by 2. (How do they do that! Try it again with a
different number.)