Illuminations Interactive Math•lets are math applets
that you can use to explore mathematics and create interactive lessons.
The Factor Game
The Factor Game is a fun interactive game that exercises your factoring
ability. Test your skills against a human or the computer. See the rules
below.
Factor Game Rules
The Factor Game Board
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Player A chooses a number on the game board by clicking on
it with the mouse. This colors the number.
Using a different color, Player B clicks on all the proper
factors of Player A's number. The proper factors of a number
are all the factors of that number, except the number itself.
For example, the proper factors of 12 are 1, 2, 3, 4, and 6.
Although 12 is a factor of itself, it is not a proper factor.
Player B colors a new number, and Player A colors all the
factors of the number that are not already colored.
The players take turns choosing numbers and coloring factors.
If a player choses a number that has no factors left that
have not been colored, that player loses a turn and does not
get the points for the number colored.
The game ends when there are no numbers remaining with uncolored
factors.
Each player adds the numbers that are colored with his or
her color. The player with the greater total is the winner.
This Factor Game applet was adapted with permission and guidance from:
Prime Time: Factors and Multiples, Connected
Mathematics Project, G. Lappan, J. Fey, W Fitzgerald, S. Friel and
E. Phillips, Dale Seymour Publications, (1996) pp.1-16.