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Sep 072013
 

Have a go at this worksheet to find all the Prime Numbers less than 100.

eratostenes

 

Now try this much bigger Sieve to find all the Prime Numbers less than 400! Start by clicking on 2 and all the multiples of 2 will be removed. Then click on 3 to remove the multiples of 3 and continue clicking on the prime numbers until you are only left with red prime numbers.

Also take a look at this video