Tic-Tac-Toe Perimeters

What You Do:

1. Decide which player will use Xs and which player will use Os.
2. Take turns selecting boxes and their perimeters.
   1. Find the perimeter of shapes depicted in square units by counting the squares around the outside. (For example, the upper left box has a perimeter of 16 units.)
   2. Find the perimeter of shapes with numeric values by adding up the given lengths. Use inference to determine missing values. (For example, the pentagon in the lower left box clearly has five equal sides, so the perimeter could be found by calculating 5 + 5 + 5 + 5 + 5.)
3. If a player gives a correct answer, they may claim the box by putting either an X or an O inside of it. For every correct answer, a player also receives 100 points.
4. When a player has attained four boxes in any row, column, or diagonal, they receive an additional 100 points.
5. Play until all of the squares have been claimed. The player with the most points, wins.

Variation:

Create your own game board! (Print out a blank game board here.)