The magical number 9

1:  Find more than one multiple of 9 such as 9 and 18. (you have to do it in order for it to work)

2: add them.  18
                       9
                   ____+

                      2  7  

3. 27 is you answer. add 2 and 7 to make 9! you can do it with as many multiples of nine as you want and it will still be the same! (remember you have to do it in order!)