How do adding-up card games such as cribbage use card values?

In adding-up card games like cribbage, card values are used to maintain a running total of the cards played to the table, with the primary objective being to reach or avoid specific totals.1

In cribbage, the values are assigned as follows:
* Face cards (Jack, Queen, King): Count as 10 each.2
* Ace: Counts as 1.23
* Other cards: Count according to their index value (number of pips).2

During the play phase, players take turns laying cards faceup and announcing the new cumulative total. The game involves strategic play to reach exactly 31 (scoring two points) or to avoid exceeding 31. Additionally, players use these values to form specific combinations—such as pairs, runs, or totals of 15—which are scored by "pegging" on a cribbage board or other tracking device. These combinations can be formed during the play or during the "showing" phase, where the cards in each player's hand are evaluated against the starter card.2