Calculator Tic-Tac-Toe

Calculator Tic-Tac-Toe

In this fun twist on the popular game of Tic-Tac-Toe, Player X chooses 2 numbers from the list and uses the calculator to find the sum.  If the sum appears on the game board, it is marked with an X.  If it is not on the game board or is already marked, the player loses a turn.  Player O repeats this procedure.  The first player to get 4 in a row, wins. 

The game board could easily be adapted according to skill level and mathematical operation.