Please select a card, and remember the number of cards (ace is 1 min, Q is 12 min) and the color.

Let him multiply the number of cards by two.

Add 3 to the total.

Multiply the total by five.

When finished, tell them to pay attention to the color.

If so

Block + 1

Plum blossom +2

Red heart +3

Spades +4

Then teach the audience to tell the total.

You can know what that card is from the total. ..

secret

Is to subtract 15 from the total added by the audience.

You may get two or three numbers.

The last digit is the suit (1 is diamonds 2, clubs 3, hearts 4 and spades).

The first one or two are points.