Ask the audience to multiply by 9 any number except one. The result is a two-digit number. Focus you can build a variety of ways:
1. Let the audience tell you the first digit of the resulting number, and you will immediately call the second.
2. The spectator calls you the second digit of the number, and you instantly call first.
3. The spectator calls you the first or second digit (decide for yourself what is unimportant, but the viewer must tell you, first or second) and you will call the number.
How to do it? The secret is simple. Any number multiplied by 9, the result always gives a two-digit number, the digits of which, if they make among themselves, give a total of 9.
For example: 9 x 3=27. You say, was called from this number figure 2. Then you take 9 2, 7 turns, and immediately called all the number - 27.