That's where the magic of math with cards is
September 27, 20244 Mins Read
Magicians can perform many magic tricks with the help of cards. There is more manual labor than science or math. This means that the magician will change the card before your eyes or hide it in your hand, you will not notice it. But we have no place to clean our hands in this magic. It's all math. With the help of this magic, you will learn how to guess the cards in other's hands. All you need is a deck of cards and a calculator. So let's begin.
Math with cards
Suppose I have a betting card in my hand. That means total 52 cards. I shuffled them around a few times and showed them to you. I have given the cards to you to ensure that there is no tampering in the cards. You also shuffled them a few times. Now I told you to pick up any card. Only you will see the card you took. Don't show me your mind.
If your hand is a face card (jack, queen or king) or a 10 card, discard it and draw another card from my hand. In simple words, the card you are taking should be a card with numbers from 1-9. Although there is no single written card. So one of the 8 cards from 2-9 is enough. Assume your hand card is a spade or 7 of clubs. You will not show this card to anyone.
Now I'll take a card and see for myself. Do not show this card to you or anyone. Assuming, I have the 4 club card. Only numbers matter in this magic. Horatan or Eskapan is not important. Now multiply the number of the card you have taken by 2. Since you have card number 7, multiply by 2 to get—7 × 2 = 14. Then add 2 to the product. Then 14 + 2 = 16.
Now the sum must be multiplied by 5. You can use the calculator here. So 16 × 5 = 80. Now subtract 6 from this product. So 80 – 6 = 74. Now show me your card. I took your card and placed it on a table.
But you don't know the cards in my hand yet. I will put my card to the right of your card. Now it's your turn to be surprised. Because the number 74 is made up of two cards together. This is the number you have been calculating for so long. That is, I guessed your card. Ha ha ha…that's magic. But how did I guess? What is the math behind it? Let's teach.
At the very beginning, make sure that the number of cards is between 2-8. Then multiply the number by 2 and add 2. That is, (7 × 2) + 2. Then multiply by 5. If you notice, you will see that we are multiplying by 10 in total. First I multiplied by 2, and now by 5. That is, multiplied by 5 × 2 = 10. Also we have multiplied by 2 plus 5. Then the equation becomes:
(7 × 2 + 2) + (2 × 5) = 80. Then I asked you to subtract 6. This is the real key to magic. You have to calculate how much you want to subtract. It is not a fixed number. Each digit must be subtracted one at a time. How do you know when to subtract a number?
very simple The number on the card in my hand must be subtracted from 10 first. I had club number 4 card in my hand. So 10 – 4 = 6. That is, I asked you to subtract 6. If I had the 7 of spades in my hand, I would tell you to subtract the 3. Because, 10 – 7 = 3.
But why does this number match? Look, I asked you to add, subtract and multiply, and you got 80. Subtracted 6 from there. So, there is no way without becoming 74. Because I made 80 with you first by adding, subtracting and multiplying. Then I subtracted 6 from there. I must have 74 then.
Again if you add and subtract to make 90 and I ask you to subtract 7, then surely 83 will remain. Then you will have a number 8 card in your hand and I will have a number 3 card in your hand. 83 will sit side by side.
