Time to mess with your number!

What I want you to do is to take the two digits of your number and add them together for example: 
If you thought of 12
1+2 = 3
If you thought of 98
9+8 = 17

Have you done that? 

Great! Now subtract that new number from your original two digit number that you thought of.. 

You now have a brand new number that is totally random! Don't forget this number.