Number Magic

You will need a calculator for this:

Take the number of the month you were born,  
multiply by 4,
add 13,
multiply by 25, 
subtract 200,    
add the day of the month on which you were born,
multiply by 2, 
subtract 40, 
multiply by 50, 
add the last two numbers of the year in which you were born,
subtract 10,500.

Notice anything funny about your answer? If you follow the directions exactly, your full birth date will be displayed on your calculator as your final result.

Try it with anybody's birthday, and it will always be right.  The format will be in mmddyy, so for July 6, 1959, the final result of the above calculation is: 70659

Did your math teacher teach you this?