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Prime and Composite Numbers
Old 08-04-2010, 09:53 AM
 
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Do you all have anything to share on prime and composite numbers?


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P or C
Old 08-04-2010, 05:14 PM
 
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I took red and blue construction paper and cut it into 4 pieces. I labeled one color P and the other C. I had enough for each child to have one P and one C. I would call out numbers and students would have to hold up the correct card. With them being color coded I could easily check if they got and they LOVED it. It got to be a race with them to see who could get the right answer up first.
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Old 08-04-2010, 05:55 PM
 
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MPage - Great idea! Thanks!
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a few things I do...
Old 08-05-2010, 02:23 PM
 
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They need lost of hands-on practice (if it's new to them) with building arrays.

They have a hard time keeping them straight so I teach them that the word prime has 1 syllable and it has 1 set of factors. The word composite has more than 1 syllable and it has more than 1 set of factors.

We have lockers in the classroom that are numbered so we label each locker as to whether it is prime or composite (with a magnet P or C... an N for #1 since it's neither p or c) and if it is composite then we put the multiplication facts on the locker (magnet strips) that show why it is composite. From this point on I leave them up on the lockers for the remainder of the year.
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100 chart
Old 08-05-2010, 04:05 PM
 
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I have the students use the 100 chart.. we identify if a number is prime or composite & why!


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Sieve of Eratosthenes
Old 08-06-2010, 08:34 AM
 
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I attached a copy of the the activity I used with my 5th graders.
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File Type: doc sieve.doc (86.5 KB, 256 views)
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Thanks MPage
Old 08-06-2010, 08:56 PM
 
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I loved your handout! Great idea. Thanks so much for sharing!
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Old 08-08-2010, 08:12 AM
 
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I love your handout! I usually go over all the prime numbers in my 6th grade class so we can do prime factorization. I love your handout and we can glue it into our math journals!! Thanks so much!!
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can't take credit
Old 08-08-2010, 01:16 PM
 
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It comes from the one of the 5th grade units Georgia uses to teach our "performance standards". Kids always loved it. They kept it in their math folder/notebook and had it handy to help throughout rest of the year.
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