You mean cards with the letter '5' on them? In that case, 4.
There are 52 cards in a deck of cards.
52 cards in a deck
One possible example is the number of red cards in a regular deck of cards.
a collection of cards
There are 52 cards in a regular deck of cards.
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54 Cards in a Deck (with the Jokers)
The standard collective nouns for playing cards are:a pack of cardsa deck of cards
78 Cards in a Tarot Deck
52 cards in a deck i.e. playing cards in a pack
The Deck of Cards was created in 1948.