This is the game of "Noughts and Crosses" or "Tic Tac Toe".
In how many different ways can the first "X" and "O" be placed on the grid?
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Topics: Starter  Combinations  Puzzles
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Previous Day  This starter is for 7 November  Next Day
Teacher, do your students have
access to computers? 

Here a concise URL for a version of this page without the comments.
Transum.org/go/?Start=November7
Here is the URL which will take them to a similar activity.
The javascript for this game above was kindly made public by Stephen Ostermiller (GNU General Public License as published by the Free Software Foundation) who also provides an excellent description of TicTacToe Strategy.