Here is a math trick so unbelievable that it will stump you. (Or at least it stumped me)
Personally I would like to know who came up with this and where they had the time to figure this out. I still don't understand it!
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?
(Thanks to a special friend for that one)