Mathematical Trickery

I remember receiving this *unbelievable math trick* in my email about 3 years ago. Go on, impress your friends and family, be the life of the party. Show your boss, impress your co-workers, show the hooker who gave you genital warts this incredible trick. She will love you once again.

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)
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

Do you recognize the answer?

When you get to part 6 & 7, don't add up all four digits (if your last four digits are 2245, don't add 2 + 2 + 4 + 5), add them as they are listed (2245)

Tada!