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Unformatted text preview: Prime Numbers Eratosthenes’ Sieve By Monica Yuskaitis Copyright © 2000 by Monica Yuskaitis Eratosthenes (ehruhTAHSthuhneez) Eratosthenes was the librarian at Alexandria, Egypt in 200 B.C. Note every book was a scroll. Copyright © 2000 by Monica Yuskaitis Eratosthenes (ehruhTAHSthuhneez) Eratosthenes was a Greek mathematician, astronomer, and geographer. He invented a method for finding prime numbers that is still used today. This method is called Eratosthenes’ Sieve. Copyright © 2000 by Monica Yuskaitis Eratosthenes’ Sieve A sieve has holes in it and is used to filter out the juice. Eratosthenes’s sieve filters out numbers to find the prime numbers. Copyright © 2000 by Monica Yuskaitis Definition Factor – a number that is multiplied by another to give a product. 7 x 8 = 56 Factors Copyright © 2000 by Monica Yuskaitis Definition Factor – a number that divides evenly into another. 56 ÷ 8 = 7 Factor Copyright © 2000 by Monica Yuskaitis Definition Prime Number – a number that has only two factors, itself and 1. 7 7 is prime because the only numbers that will divide into it evenly are 1 and 7. Copyright © 2000 by Monica Yuskaitis Hundreds Chart On graph paper, make a chart of the numbers from 1 to 100, with 10 numbers in each row. Copyright © 2000 by...
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This note was uploaded on 11/22/2011 for the course EL ED 361 taught by Professor Brotherraymond during the Fall '11 term at BYU.
 Fall '11
 BrotherRaymond

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