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Move the corner of the rectangle. Can you work out what the purple number represents?

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I wonder which polygons we can draw on dotty paper...

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Drawing Squares

Take a look at the video showing squares drawn on dotty grids...

Creating Squares - Game

Stage: 3 and 4

This resource is part of "Dotty Grids - Drawing Polygons"

In this game, two players take it in turns to click on a dot on the grid.
The winner is the first to have four vertices of a square in their colour.

Play a few games against the computer or a friend.

This text is usually replaced by the Flash movie.


Can you develop any winning strategies?
Can you suggest any mathematically interesting variations on the game?


Want to share what you've done? Got any interesting questions or ideas? 
Send us your thoughts.