The rules to this game came from this site.
Number of players: any number, mixed ages
Equipment: math cards, one deck
Set Up
Remove the Jacks, Queens, and Kings from the deck. They won't be used.
Each player draws a card, and whoever choses the highest number will go first.Â
Then shuffle the cards and lay them all face down on the table, spread out so no card covers any other card. There are 40 cards in a deck, so you can make a neat array with five rows of eight cards each, or you may scatter them at random.
How to Play
Play proceeds to the left around the table. On your turn, you may flip two cards face up. If one of the cards is a 10, you may take it at once and flip another card face up. If the pair of face-up cards add together to make 10, you get to take the pair. If they do not make 10, leave them for a few seconds so all players can see what they are, then turn them face down and let the next player take a turn.
Optional rule: If a player finds a pair, he gets a free turn and may try for another pair right away.
Endgame
When all the cards are claimed, whichever player has collected the most cards is the winner.