1.draw up a chart 1-100
2.get rid of 2's multiples
3.get rid of 3's multiples
4.get rid of 5's multiples
5.get rid of 7's multiples
6. all the left over numbers are prime.
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The Sieve of Eratosthenes filters numbers, letting the composites fall through while the primes remain.
It was around 200 BC.
One
A sieve.
composite numbers