Form a group of three students. The Mind Reader shuffles the deck of cards and puts it out in front of the two other players. Each one picks a card and does not look at it, but instead holds the card against their foreheads, facing out so the Mind Reader can see them. The Mind Reader then tells them the product of their two cards. If the cards are a 9 and a 3, for example, the product would be 27. Now the other two players go back and forth trying to guess the two cards. Whoever guesses right wins the round and the roles rotate.

This game is a simple revision of the traditional card game of war. This fast-paced card game challenges players to quickly perform mathematical operations in their head to beat their opponent. Each player is dealt an equal number of cards from the deck, which they keep face down in a pile. When the players say “Go!”, each player flips over the top card from their own deck and show each other their card. The first player to call out the sum of the cards takes the set of cards and sets them aside. The players immediately flip over the next top cards in their deck and repeat. The player with the most amount of cards when the decks are exhausted wins.