1. Remove the kings from the deck of cards.
• Aces count as 1s, jacks count as 11s, and queens count as 12s.
• Red cards are positive.
• Black cards are negative.
2. Take turns dealing the cards. Shuffle the cards and place them face down in a pile.
3. Player 1 draws four cards. Using the equation ax + b = cx + d, let the cards represent the values of a, b, c, and d, in order, as they are drawn.
Player 2 starts the timer. Player 1 has 20 s to determine the value of x using the values of the four cards. If the value is correct, the player is awarded 5 points.
4. Play moves to Player 2.
5. Play ends when there are less than four cards in the pile. The winner is the player with the highest score.
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