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Eratosthenes Sieve

This is an Excel file which is used to display Eratosthenes' Sieve on a projector. 

Use the Format Painter to change the colour of the appropriate cells to demonstrate how the sieve works. If you double-click the Format Painter button on the toolbar, it "latches" on, until you click the button again. This will save you having to keep turning it on for every cell!

This resource requires that the user is familiar with Eratosthenes' Sieve and is merely using the tool to illustrate an explanation. See the wikipedia link below for an automated animation that requires no prior knowledge (though the description there is a little hard to follow).