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'Tablecloth Interactivity - Extension' printed from http://nrich.maths.org/

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Instructions for the interactivity
 
Click on the colourbar to choose a colour, then click on your chosen squares of the tablecloth to colour them in. Once you've finished with the first colour, choose a new colour from the colourbar.
 
If you make a mistake, you can just select a different colour and click over the square you want to change.
 
If you run out of colours, tick the "With Dots" box for extra colours with dots.
 
Once you have finished, click "Check" to see if your design satisfies any of the symmetries, and if you have used the maximum number of colours.