You will need a calculator. 
  
First, pick a phone number.. (home, work, friend, or any number) 
  
Enter the first 3 nubmers. (734-XXXX) 
  
Multiply it by 80. 
  
Add 1. 
  
Multiply it by 250. 
  
Now add last 4 numbers. (XXX-2782) 
  
Add last 4 numbers again. 
  
Subtract 250. 
  
Finally, divide it by 2. 
  
What numbers do you see?