Take your hand off the mouse and choose a number from one to a hundred! Any one! (e.g.: 74) Add the numbers (e.g.: 7+4=11) Take away the sum from the number you originally chose (e.g.74-11=63) Remember the figure next to the number you now have.
You only chose a number in your thoughts, however I shall guess which figure you chose!
Take your hand off the mouse and choose a number from one to a hundred! Any one! (e.g.: 74)