In blackjack, an ace is worth either 1 point or 11 points. You assign the value based on whichever number is more advantageous to you. For example, if you have a queen and an ace, the ace would be worth 11 to give you a blackjack. If you have an ace and a 6, your hand is worth either 7 or 17 points, and you could stand with the 17 or hit for a chance at a higher total.