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# Prime Numbers

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### Prime Numbers

1. 1. Prime NumbersEratosthenes’ Sieve<br />By Monica Yuskaitis<br />
2. 2. Copyright © 2000 by Monica Yuskaitis<br />Eratosthenes(ehr-uh-TAHS-thuh-neez)<br />Eratosthenes was the librarian at<br /> Alexandria, Egypt in 200 B.C. <br />Note every book was a scroll.<br />
3. 3. Copyright © 2000 by Monica Yuskaitis<br />Eratosthenes(ehr-uh-TAHS-thuh-neez)<br />Eratosthenes was a Greek mathematician, astronomer, and geographer.<br />He invented a method for finding prime numbers that is still used today.<br />This method is called Eratosthenes’ Sieve.<br />
4. 4. Copyright © 2000 by Monica Yuskaitis<br />Eratosthenes’ Sieve<br />A sieve has holes in it and is used to filter out the juice.<br />Eratosthenes’s sieve filters out numbers to find the prime numbers.<br />
5. 5. Copyright © 2000 by Monica Yuskaitis<br />Definition<br />Factor – a number that is multiplied by another to give a product.<br />7 x 8 = 56<br />Factors<br />
6. 6. Copyright © 2000 by Monica Yuskaitis<br />Definition<br />Factor – a number that divides evenly into another.<br />56 ÷ 8 = 7<br />Factor<br />
7. 7. Copyright © 2000 by Monica Yuskaitis<br />Definition<br />Prime Number – a number that has only two factors, itself and 1.<br />7<br />7 is prime because the only numbers<br />that will divide into it evenly are 1 and 7.<br />
8. 8. Copyright © 2000 by Monica Yuskaitis<br />Hundreds Chart<br />On graph paper, make a chart of the numbers from 1 to 100, with 10 numbers in each row.<br />