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Way back in ancient Greece, a
mathematician called Eratosthenes
( c. 276 BC - c. 195 BC ) came up with a cool way to find prime
numbers. By the way, don't try to say his name with a mouthful
of soda crackers! Especially not if I'm standing in front of
you.
Here's his method:
The Sieve of Eratosthenes:
You start by making a grid of the
numbers 1 - 100:
First, we cross out
1,
since we know it isn't prime:
Continued on the
next
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