Perhaps the simplest of all kid's card games, slapjack is appropriate for even the youngest card players. Deal the entire deck out to all players at the table. Players keep their cards face down on the table and on cue, flip the first card in their stack face up in the middle of the table. The players continue to flip cards until a Jack is played. When a Jack is played, players must scramble to be the first to slap their hand onto the stack of cards. The person who slaps first is the winner and places the entire stack underneath his own stack. Play continues until only one player is left with cards.
Read more: http://www.ehow.com/info_7913010_kids-card-games.html#ixzz2mgKfgFZS