You mean cards with the letter '5' on them? In that case, 4.
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One 5 of diamonds in a deck of cards
There are four '5' cards and four '!0' cards.
There are 4 fives and 26 black cards in a standard deck.
According to Hoyle - when you cut, you must take at least 5 cards and at most 47 cards from the top of the deck.
There are four 5 and four 9 cards. Thus 8 out of 52 cards are 5 or 9.