Four cards, one rank
The version taught on this site collects four-of-a-kind books. For example,7♣,7♦,7♥ and 7♠ form one book. Show a completed book and set it aside; those cards are no longer in the active hand.
Do not mix a different goal
Some games called Fish collect pairs. A picture-matching exercise may also use pairs. Those are different setups. Our printed training deck has four copies of each rank, distinguished by suit, because it follows the four-card-book goal.
Inspect the transfer
When the named opponent has the requested rank, they give all their cards of that rank. If the transfer completes a book, make its four-card composition visible while teaching. In our successful-ask demonstration the requester keeps one different card, so the continuing turn is easy to inspect.
Count groups without a ranking claim
A standard deck contains thirteen possible rank books. The reduced printable contains four. These counts describe the chosen deck, not a measure of a child’s skill. Check a deck by rank and suit before starting.