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Twenty One (Addition/Subtraction Game) April 9, 2009

Posted by inspiremath in Addition/Subtraction, Math Games.
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●4 to 6 sets of 0-11 cards.

Shuffle cards and deal one card face-down and one card face-up to each player.   Players may not look at their face-down cards until the end of the play.  The object of the game is to get a total of 21 (but not over 21) in the face-up stack.   The leader asks each player if they want another card face-up on their stack, but the player also needs to take into account that they don’t know what the value of the face-down card is, which will be added to the stack after they tell the leader to stop adding face-up cards.  When everyone has decided to stop, everyone looks at their cards to see who is closest to 21 without going over.  They win all the cards in play.  If there is a tie, each person gets half the cards.    For example, if you have a 2 in your face-up stack, you would probably want to ask for another card in that stack, since the highest you could have face-down would be 11 for a total of 13.  So say you ask for another card and you get a 5.  Then you tell the leader you don’t want any more cards.  When everyone counts their cards, you would add 2 plus 5 plus the face down card which just happened to be an 11, and you’d get 18.

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