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A little magic trick about mathematics
1. Effect: Let the audience randomly pick a card from a deck of cards facing down and watch it put at the bottom of the card. After cutting the cards twice, tell him, "Now your cards are face up."

Then sure enough, a card has been turned upside down, but the audience said it was not his card.

You said of course not, because this is a prophecy card (such as four hearts), and then four cards from the bottom, which is the card chosen by the audience.

Teaching: Before the performance, secretly turn a card face up and insert it into the card.

Insert it in the last few pages, and the smaller the number, the better. Be careful not to cut the card too many times)

And don't confuse the location of the prediction card and the target card. That's it,

Wait for your friend to surprise you later. But you know, you can only perform once, and no matter how much he asks you, he won't perform again. Unless you want to tell him how to perform.

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2。 Mathematical guessing magic

(1) Ask the other party to write a five-digit number casually (all five digits are not the same)

(2) Use these five numbers to form another five numbers at will.

(3) Subtract two five-digit numbers (reduce large numbers).

(4) Let the other person think of any number and tell you other numbers (except the one that the other person thinks of).

5. The performer only needs to add the number spoken by the other person to one digit and subtract 9 to know what the other person is thinking.

Example: five digits one: 57429; Five digits two: 24957; Subtraction: 32472;

Remember in your heart: 7; Tell the rest to the executor: 3242;

Performer: 3+2+4+2 =11; 1+ 1=2; 9-2 = 7 (that is, the number remembered by the other party)

Ask friends A and B to choose a number from one mile to nine miles and memorize it (assuming it is 8 and 3).

Then ask a friend to add his number x 5 to 7 (now it is 47)

Then ask friend A to tell friend B the number he got in a low voice.

Ask friend b to add the number x 2 he got to the number he thinks (now it is 97)

~ and then let b tell you the result. He said, 97

Tell me right away, I know what number you two chose. A is 8 B, and 3 always succeeds.

The key is that after he tells you the result, he cuts it into 14 97- 14 = 8 3. Choose ten digits first, then one digit. * * Remember that only 1~9 can be selected. Just try it.