Swedish card game to teach children math.
Two decks of cards - one with questions, one with answers. Each player get five question cards. One answer card is placed face up on the board. The first player looks to see if he has any question card that matches.
For instance if in the answer pile lays "=7" and the first player has the card "7x1" then he can pick up the answer card and take the pair and put it to the side. If the first player has a pair but does not know the answer another player can take his question card and get a pair for himself.
If nobody has the question card to the answer card it is put into the center of the table. Then a new answer card can be turned up and the game continues to the next player in turn. Each player gets a chance to see if they have a matching pair.