n 0in 0pt">It takes less than a second for 12-year-old Jennifer Sirrine to look at the 12 cards on the table and call “set!” as she points at three cards. At nearly the same time, her brother Alex, 14, picks out different cards and cries out the same word. Their mother, Sumiko, stares at the cards and then her children. She says nothing. Unlike the two younger players, she has not yet found a “set.” She is baffled, amused and only slightly chagrined.

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In the game of set – invented by a mathematician – players peruse an array of cards with various attributes to find “sets” – three cards in which each of the characteristics is the same on each card or different on each card. The rules sound easy, but try it against experienced players like Jennifer and Alex!

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n 0in 0pt">Set is a game of perception and logic, and good players develop a mental agility that leaves inexperienced opponents shaking their heads.

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n 0in 0pt">“They beat me every time,” says Sumiko with apparent satisfaction, despite her poor performance. “They’ve gotten much better at logical thinking than I am.”

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n 0in 0pt">Age means little in an analytical game like set. In a recent tournament in the Sirrines’ community, a 9-year-old emerged victorious from a field of competitors ranging in age from 6 to 80! Sumiko believes that her children’s love of games like set is part of the reason why both are “A” students in math. “Games help them to think quickly and recognize complex patterns,” she says.

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At the age of 6, David Green discovered the card game rummy and became the official family scorekeeper. His passion was adding everyone’s score as quickly as possible. A run like

In another favorite game, “Crazy 8’s,” the scoring includes subtraction. Now 9, David still plays card games and he can mentally add strings of three-digit numbers in seconds.

The game of cribbage caught Oren Stoelting’s fancy when he was 10, and he even made his own wooden cribbage board – a math project in itself! Scoring in cribbage requires flexible thinking and the ability to see subtle number combinations. A pair is worth two points and any run of three cards is worth three, so a hand with 4, 5 and two 6’s would yield eight points: two for the double 6’s and six for the two runs (each 6 combined with the 4 and 5 makes a separate run). Try scoring 5, 5, 6, 7, 7 to get 16 points and you’ll see how agile your mind must be.

A few additional rules make the scoring even more complex. A player who fails to calculate how many points he has earned will suffer because his uncredited points go to an astute opponent who sees them. That’s Oren’s favorite part of the game.

“I *definitely* like taking the points that my opponent didn’t realize he had. It’s *quite* fun!” he says.

Not all games are created equal. The best math games require players to think analytically, develop a winning strategy, use basic math skills – or all of the above. Games that rely mostly on chance will do less to hone a child’s mathematical thinking. But even a simple game of chance like “War” (where each player turns over a card and the one with the higher card takes both) can be improved. Why not have each player draw two or more cards and add them together? Or multiply them. Once mastered, any game can be changed. Coming up with variations is part of the fun, and with each variation, players must adapt their strategy.

Research shows that children learn best when they are happy and relaxed, not anxious or stressed. What better way to encourage relaxed and happy mathematical learning than through games? There’s only one catch: you must be ready to be trounced by your kids!