This math trick is really cool. Just try it!
Grab a calculator (You won't be able to do this one in your head)
First Key in the first three digits of your phone number (NOT the area code) if your # is 123-4567, the 1st 3 digits are 123)
Then Multiply by 80
Next Add 1
Then Multiply by 250
Add the last 4 digits of your phone number
Next Add the last 4 digits of your phone number again
Subtract 250
Divide number by 2
Do you recognize the answer?
This only works with american phone #'s