Number cards have their face value, jacks, kings and queens are worth 10.Aim of the 21 Card Game is to get 21 or as close to as possible.We take turns in being the dealer – 5 hands each.We don’t bet – it is just all about the numbers!.There are many variations on the rules for 21 Card Game, but here is how we play: I am happy to play with him as it is a quick game to play and it helps work on his mental maths. We have been playing this game for a while and he really enjoys it. One of my brother in laws is a keen card player and after watching a game of 21, master 6 quickly wanted to be taught how to play. He is always wanting me to give him sums to do.