Math Standard I-3 And 4 Activitiy Sheet - Divisibility Rocks - Grade 5 - Utah State University - 2007
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10Math Standard I-3&4—Activities
How to Play “Divisibility Rocks”
1. Take a deck of cards, a Divisibility Key, and a bag of rocks.
2. Divide the cards face down evenly among players. Discard any extras.
3. Place the pile of rocks in the center of the playing circle.
4. Decide who is first. The person to his right is in charge of the Divisibility Key.
5. The first player turns over his top card and decides if the number on the card is
divisible by 2, 3, 5, 9, and 10. He takes one rock from the center pile for each “yes”
answer.
6. If the player to the left disagrees, he or she may “challenge” by saying “Challenge!”
Then both players appeal to the person holding the key to see who is right. If the
challenger is correct, that person gets the rocks. If the challenger is incorrect, the
original player gets to keep the rocks and the challenger loses his or her turn.
7. Play continues clockwise with each person taking a turn, rotating the person who
holds the key and the person who is the challenger.
8. When every player has had a turn, the rocks are counted. Whoever has the most
rocks gets to keep all the cards from that turn. The rocks are returned to the center
pile.
9. If there is a tie, both players involved in the tie turn over their next card and collect
the rocks for that card. Whoever holds the card that earns the most rocks wins the
round.
10. A player is out when he or she is out of cards; the player with all the cards at the
end of the game is the winner.
11. To shorten the game, the teacher may set a time limit; the person with the most
cards at the end of the allocated time is the winner.
Utah State Office of Education/Utah State University
4-25
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