You friend will choose a card mentally from a set of 21 cards and when "MATH IS FUN" is spelled out you will see the card your freind choose. 

Things you need: a deck of playing cards. 

What to do:  

1. Shuffle the ceck, then count out 21 cards, put the rest aside. 

2. Deal out three piles of seven cards each, face down on the table. Deal the cards from left to right, one pile at a time, as if you were dealing to three players in a card game. There is no need for you ever to see the faces of any of the cards. 

3. Ask your friend to choose one of the piles. Take the pile that he chose in your hand, fan out the cards towards him, and ask him to mentally select any card. 

4. Put the pile that he chose between the other two piles so that you again have a pack of 21 cards in your hand. 

5. Once more, deal out three piles of seven cards each, face down on the table. Taking up one pile at a time, fan out the cards towards your friend and ask him which pile has his chosen card. Again, put the pile that has his chosen card between the other two piles so that you have a pack of 21 cards in your hand. 

6. Repeat Step 5 one more time. 

7. Tell your friend that you are going to say the magic word "MATH IS FUN" and his chosen card will magically appear. Slowly spell "MATH IS FUN," turning over one card for each letter. The last card that you turn over will be your friend's chosen card!!