You have a box set with 6 laser engraved wood cards each about 5.4” x 1.4”and about ¼” thick. Each card has the Word MAGIC written across the top. Below each of the word MAGIC letter is a number. The numbers of the 6 cards are all different.
Here is the effect... Ask 5 people to each select one card, it is not necessary that you know which cards they have. There will be one remaining, so set that aside.
Announce that you are going to write down a number on a piece of paper. Fold it and set it aside.
Next ask one person to shout out a number below the letter M on their card. Any person can do this. Write that number down. Next, a different person gives you the number below the letter A on their card. Write down that number below the first number (as we will be adding all the numbers). Next, a third person gives you the number below G on their card. Then a fourth person gives you the number below I and the fifth person the number below C. Now everyone has contributed 1 number.
Ask someone to add up all 5 numbers. Once this is done and announced, open the piece of paper that you had set aside at the beginning of the trick. You will have written down a matching number.
This trick can be performed with less than 5 people of course. Just divide up the cards between whoever is there, or even give them all to one person. Just make sure that each card is only used one time when numbers are provided.