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Prime and Composite Numbers

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Prime and Composite Numbers
Old 08-04-2010, 09:52 AM
 
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Do you all have anything to share on prime and composite numbers?


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I made...
Old 08-04-2010, 10:15 AM
 
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these to post up in my room. (Just a quick definition of prime and composite) I'll post the page I have devoted to the number 1 in the next post.

Nothing too fancy.
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File Type: doc prime and composite.doc (27.0 KB, 369 views)
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2nd Part
Old 08-04-2010, 10:16 AM
 
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Can't leave 1 out!
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Old 08-04-2010, 10:27 AM
 
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I gave my students a hundreds chart and had them highlight the prime numbers. I then had them put that chart in a plastic sleeve and put it in their 1-1/2 inch 3-ring math binder to use as a reference. It worked out very well.
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Here's a cool thing...
Old 08-04-2010, 01:59 PM
 
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Write out the numbers 1-20 on a sheet of paper. Write them balloon style so students can color them in when given the direction to do so. Since 1 is not prime or composite, it doesn't get colored in at all.
Two is prime so the whole number two gets colored in (red).
Three is prime, but different than two, so gets colored in a different color (green).
Four is composite. Draw a line dividing the number in half horizontally. Since its factors are two and two, draw the upper half red as well as the lower half.
Five is prime, but different than two and three, so gets colored in a different color (blue).
Six is composite. Draw a line dividing the number in half horizontally. Since its factors are two and three, the upper half is colored red and the lower half is colored green.
Seven is prime and needs to be a different color than what has been used so far (yellow).
Eight is composite. Draw a line dividing the number in half horizontally. The upper half will represent the 2 in 2 x 4 and will be colored red. The lower half represents 4, so draw a line dividing the lower half in half again and color both sides red as well. In this manner, you are also teaching prime factorization (2 x 2 x 2 =8)

Keep going in this manner, filling in the sheet. At the end, students can visually see the prime numbers (solid colors) versus the composite numbers (multicolored or divided into smaller parts).

If this is not clear to you, let me know. I have an example at school and could post a copy.


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Old 08-04-2010, 03:36 PM
 
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We review prime and composite numbers daily during Calendar. The first thing we do, it list all of the arrays for a number. Then, from those arrays, we list the factors. Using hand motions (since I want to get them all actively involved during Calendar), they tell me if it is prime or composite. We say the following:

Prime numbers have 2 factors and 2 arrays. (showing two piece signs on our fingers and shaking them)
Composite numbers have more than 2 factors and more than 2 arrays. (making a "bursting" motion into a rainbow...that is a weird description of it..sorry!)

Since they can visually see the arrays and factors daily, recognizing prime and composite numbers becomes second nature.
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Old 08-04-2010, 06:14 PM
 
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Thank you all so much!
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Thank you
Old 08-05-2010, 02:59 AM
 
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for the posters but is the #1 poster supposed to say it is not composite on the bottom. The word composite doesn't show up.
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Six Pack
Old 08-05-2010, 08:54 AM
 
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I do a lot of the activities mentioned, but I also have the students memorize the "Six Pack." They draw a rectangle with six compartments and put the numbers 2, 3, 5, 7, 11, 13 inside. It's a good visual and it helps job their memories about what prime numbers are.
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#1 poster....
Old 08-05-2010, 12:02 PM
 
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I used a special font I downloaded, so that probably changed the formatting.


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