This game is for 2 players, ages 8-12. Required materials include colored bingo chips in 3 different colors.
Instructions: Player A places a green bingo chip on any number on his board. Player B places yellow bingo chips on his board on all of the proper factors of player A’s number. Proper factors are any factor of the number except the number itself. After Player B marks all the factors (or thinks he has marked them all) he places a green bingo chip on a new number. It cannot be the same number that Player A marked with his green chip during his most recent turn. Now, player A marks all the factors on his board (using yellow chips) that go with player B’s number. If a player places a green chip on a number that has no corresponding factors remaining, the green chip is replaced with a red chip, and the player’s turn is over. If there are no more numbers with factors, the player places a red chip on one of the remaining numbers. Play continues in this way until every number is covered with a bingo chip. Green and yellow numbers are added together to get the total score. Numbers with red chips are excluded. The player with the highest score wins!