Anyone for a card trick?
This is a game where you tell a friend you will be able to determine the exact card they select from a deck of cards.
Each card has a number value.*
Suppose your friend selects a 4 of Hearts!
Ask your friend to:
Double the card number 4 x 2 = 8
Add 3 8 + 3 = 11
Multiply by 5 11 x 5 = 55
Add 1 if the card is a Club
Add 2 if the card is a Heart 55 + 2 = 57
Add 3 if the card is a Spade
Add 4 if the card is a Diamond
Ask your friend for the number
Then you take the number and secretly subtract 15 from the total they give you. 57-15 = 42
Now you tell your friend that you know exactly what card they are holding.
The first digit is a 4 so the number on their card is a 4. Use the key above to see if the second digit tells whether the card is a Club, Heart, Spade or Diamond. Since it is a 2, the card is a heart. Your friend has the 4 of Hearts.
*Aces are 1, Jacks are 11, Queens are 12 and Kings are 13
Mary Ellen Huggins: Mount Vernon Schools Teaching and Learning
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