That’s it! You’ve finished! All remaining numbers are prime numbersĭownload the above prime numbers poster here.ģ | Finding prime numbers – The sieve of Eratosthenesįor something like prime numbers, getting children to wrap their heads around the idea isn’t always straightforward, so watching may be a better approach.The final number left in the first row is number 7, so keep it, and cross off its multiples.Again, keep it, but cross off any multiples of 5 that are still leftĤ has been crossed off, so go to the next number, which is 5.Number 3 is also prime, so keep it, and cross off any remaining multiples of 3.Keep number 2, because it’s a prime, but cross off all multiples of 2 (the rest of the even numbers).Start by crossing off 1, because all prime numbers are greater than 1.If you’re looking for a guide on walking your students through the process of figuring out the prime numbers on a 100-square these step-by-step instructions from Teaching Ideas may come in handy.
This video runs through the method for finding primes up to 100 known as the sieve of Eratosthenes.
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