The performer handed a deck of cards to the audience, then turned around and asked the audience to follow his password.

1.

Put three piles of cards on the table, and the number of cards in each pile should be equal (assuming 15 cards), but don't tell the performers.

2.

Take four cards from the second pile and put them in the 1 pile.

3.

Take eight cards from the third pile and put them in 1 pile.

4.

Count how many cards are left in the second pile (1 1 in this example), and take the same number of cards from 1 pile and put them in the third pile.

5.

Take five cards from the second pile and put them in the 1 pile.

The performer turned around and said, "Take away the second and third stacks, so there are still 2 1 cards in the1stack, right?" The audience counted it, and it was 2 1.

Secret:

This is a magic designed by using the principle of identity transformation in mathematics.

Be sure to remember: first, the number of cards at the beginning of each pile must be equal.

The second time is the third time to take an equal number of cards from the 1 heap. In this example, the mathematical formula is

4*2+8+5=2 1

Comments and suggestions:

This is a magic completely performed by mathematical laws, and the audience in this magic should be more "honest". If he doesn't do exactly what you say, your last move will fail. However, the most puzzling thing about this kind of magic is that the audience completely controls the cards. And it is very interactive. Of course, not all the audience are such "honest people". To deal with them, we need to use some "forced card" magic.