logging in or signing up Prime Numbers FunnyGuy Download Post to : URL : Related Presentations : Share Add to Flag Embed Email Send to Blogs and Networks Add to Channel Uploaded from authorPOINT Insert YouTube videos in PowerPont slides with aS Desktop Copy embed code: (To copy code, click on the text box) Embed: URL: Thumbnail: WordPress Embed Customize Embed The presentation is successfully added In Your Favorites. Views: 1885 Category: Education License: All Rights Reserved Like it (2) Dislike it (0) Added: June 15, 2007 This Presentation is Public Favorites: 2 Presentation Description No description available. Comments Posting comment... By: masalas (18 month(s) ago) Would it be possible to get a copy of this presentation for my class? masalas@wuesd.org. Thank you Saving..... Post Reply Close Saving..... Edit Comment Close By: aresvanart (36 month(s) ago) I was hoping I could download this to use with my math class (I teach fifth and sixth grade teachers) prime numbers are so difficult to teach....Thanks Saving..... Post Reply Close Saving..... Edit Comment Close Premium member Presentation Transcript Prime NumbersEratosthenes’ Sieve: Prime Numbers Eratosthenes’ Sieve By Monica Yuskaitis Eratosthenes(ehr-uh-TAHS-thuh-neez): Eratosthenes (ehr-uh-TAHS-thuh-neez) Eratosthenes was the librarian at Alexandria, Egypt in 200 B.C. Note every book was a scroll. Eratosthenes(ehr-uh-TAHS-thuh-neez): Eratosthenes (ehr-uh-TAHS-thuh-neez) 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. Eratosthenes’ Sieve: 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. Definition: Definition Factor – a number that is multiplied by another to give a product. 7 x 8 = 56 Factors Definition: Definition Factor – a number that divides evenly into another. 56 ÷ 8 = 7 Factor Definition: 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. Hundreds Chart: Hundreds Chart On graph paper, make a chart of the numbers from 1 to 100, with 10 numbers in each row. Slide9: Hundreds Chart Slide10: 1 – Cross out 1; it is not prime. Hint For Next Step: Hint For Next Step Remember all numbers divisible by 2 are even numbers. Slide12: 2 – Leave 2; cross out multiples of 2 Hint For Next Step: Hint For Next Step To find multiples of 3, add the digits of a number; see if you can divide this number evenly by 3; then the number is a multiple of 3. 2 6 7 Total of digits = 15 3 divides evenly into 15 267 is a multiple of 3 Slide14: 3– Leave 3; cross out multiples of 3 Slide15: To find the multiples of 5 look for numbers that end with the digit 0 and 5. Hint For the Next Step 385 is a multiple of 5 andamp; 890 is a multiple of 5 because the last digit ends with 0 or 5. Slide16: 4– Leave 5; cross out multiples of 5 Slide17: 5– Leave 7; cross out multiples of 7 Slide18: 6–Leave 11; cross out multiples of 11 Slide19: All the numbers left are prime The Prime Numbers from 1 to 100 are as follows:: The Prime Numbers from 1 to 100 are as follows: 2,3,5,7,11,13,17,19, 23,31,37,41,43,47, 53,59,61,67,71,73, 79,83,89,97 Credits: Credits Clipart from 'Microsoft Clip Gallery' located on the Internet at http://cgl.microsoft.com/ clipgallerylive/default.asp You do not have the permission to view this presentation. In order to view it, please contact the author of the presentation.
Prime Numbers FunnyGuy Download Post to : URL : Related Presentations : Share Add to Flag Embed Email Send to Blogs and Networks Add to Channel Uploaded from authorPOINT Insert YouTube videos in PowerPont slides with aS Desktop Copy embed code: (To copy code, click on the text box) Embed: URL: Thumbnail: WordPress Embed Customize Embed The presentation is successfully added In Your Favorites. Views: 1885 Category: Education License: All Rights Reserved Like it (2) Dislike it (0) Added: June 15, 2007 This Presentation is Public Favorites: 2 Presentation Description No description available. Comments Posting comment... By: masalas (18 month(s) ago) Would it be possible to get a copy of this presentation for my class? masalas@wuesd.org. Thank you Saving..... Post Reply Close Saving..... Edit Comment Close By: aresvanart (36 month(s) ago) I was hoping I could download this to use with my math class (I teach fifth and sixth grade teachers) prime numbers are so difficult to teach....Thanks Saving..... Post Reply Close Saving..... Edit Comment Close Premium member Presentation Transcript Prime NumbersEratosthenes’ Sieve: Prime Numbers Eratosthenes’ Sieve By Monica Yuskaitis Eratosthenes(ehr-uh-TAHS-thuh-neez): Eratosthenes (ehr-uh-TAHS-thuh-neez) Eratosthenes was the librarian at Alexandria, Egypt in 200 B.C. Note every book was a scroll. Eratosthenes(ehr-uh-TAHS-thuh-neez): Eratosthenes (ehr-uh-TAHS-thuh-neez) 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. Eratosthenes’ Sieve: 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. Definition: Definition Factor – a number that is multiplied by another to give a product. 7 x 8 = 56 Factors Definition: Definition Factor – a number that divides evenly into another. 56 ÷ 8 = 7 Factor Definition: 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. Hundreds Chart: Hundreds Chart On graph paper, make a chart of the numbers from 1 to 100, with 10 numbers in each row. Slide9: Hundreds Chart Slide10: 1 – Cross out 1; it is not prime. Hint For Next Step: Hint For Next Step Remember all numbers divisible by 2 are even numbers. Slide12: 2 – Leave 2; cross out multiples of 2 Hint For Next Step: Hint For Next Step To find multiples of 3, add the digits of a number; see if you can divide this number evenly by 3; then the number is a multiple of 3. 2 6 7 Total of digits = 15 3 divides evenly into 15 267 is a multiple of 3 Slide14: 3– Leave 3; cross out multiples of 3 Slide15: To find the multiples of 5 look for numbers that end with the digit 0 and 5. Hint For the Next Step 385 is a multiple of 5 andamp; 890 is a multiple of 5 because the last digit ends with 0 or 5. Slide16: 4– Leave 5; cross out multiples of 5 Slide17: 5– Leave 7; cross out multiples of 7 Slide18: 6–Leave 11; cross out multiples of 11 Slide19: All the numbers left are prime The Prime Numbers from 1 to 100 are as follows:: The Prime Numbers from 1 to 100 are as follows: 2,3,5,7,11,13,17,19, 23,31,37,41,43,47, 53,59,61,67,71,73, 79,83,89,97 Credits: Credits Clipart from 'Microsoft Clip Gallery' located on the Internet at http://cgl.microsoft.com/ clipgallerylive/default.asp