Math card tricks

method : ask a person to chooce a card. Tell the person remember it's numerical value :
ace = 1
jack = 11
queen = 12
king = 13

tell them to double the value of the card.
Then tell them to add three to the total.
Then tell them to multiply the complete total by five.
This done ask them to concentrate on the suit.
If the card is diamond they must add one.
If the card is a club they must add two.
If the card is heart they must add three.
If the card is a spade they must add four.
They must then tell you the final total.
From this total,you immediately know the choosen card.

The screet : is to mentally subtract 15 from the given total.You will have a number of two figures,possibly three .

The last figure gives your suit (diamond 1,clubs 2, hearts 3, spades 4) well the fist figure gives you the suit.

Example : jack of clubs

11 doubles is 22,add 3--25, multiply by 5--125.Add for clubs-- makes 127. You are told that number.

Subtract 15 mentally. Result 112.Last figure (2) means club,first figure (11) means jack.