A blank grid (with answers) which is 6 wide rather than the traditional 10 wide which I now use with my classes when doing the Sieve of Erathosthenes. This is because, apart from 2 and 3, all of the prime numbers will be either 1 less or 1 more than a multiple of 6. This leads to some good discussions and can be taken further with more able classes to see why this must be the case.
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