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Prime and Composite Numbers

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 hvlawson Joined: Jul 2008 Posts: 108 Full Member
hvlawson

Joined: Jul 2008
Posts: 108
Full Member
Prime and Composite Numbers
08-04-2010, 09:53 AM
 #1

Do you all have anything to share on prime and composite numbers?

 MPage Joined: Nov 2005 Posts: 234 Full Member
MPage

Joined: Nov 2005
Posts: 234
Full Member
P or C
08-04-2010, 05:14 PM
 #2

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.

 hvlawson Joined: Jul 2008 Posts: 108 Full Member
hvlawson

Joined: Jul 2008
Posts: 108
Full Member

08-04-2010, 05:55 PM
 #3

MPage - Great idea! Thanks!

 mathtch2 Joined: May 2008 Posts: 440 Full Member
mathtch2

Joined: May 2008
Posts: 440
Full Member
a few things I do...
08-05-2010, 02:23 PM
 #4

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.

 TopTeach2 Joined: Feb 2009 Posts: 27 New Member
TopTeach2

Joined: Feb 2009
Posts: 27
New Member
100 chart
08-05-2010, 04:05 PM
 #5

I have the students use the 100 chart.. we identify if a number is prime or composite & why!

 MPage Joined: Nov 2005 Posts: 234 Full Member
MPage

Joined: Nov 2005
Posts: 234
Full Member
Sieve of Eratosthenes
08-06-2010, 08:34 AM
 #6

I attached a copy of the the activity I used with my 5th graders.
Attached Files
 sieve.doc (86.5 KB, 256 views)

 westwood Joined: Sep 2007 Posts: 423 Senior Member
westwood

Joined: Sep 2007
Posts: 423
Senior Member
Thanks MPage
08-06-2010, 08:56 PM
 #7

I loved your handout! Great idea. Thanks so much for sharing!

 dbmwhaley Joined: Aug 2008 Posts: 144 Full Member
dbmwhaley

Joined: Aug 2008
Posts: 144
Full Member

08-08-2010, 08:12 AM
 #8

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!!

 MPage Joined: Nov 2005 Posts: 234 Full Member
MPage

Joined: Nov 2005
Posts: 234
Full Member
can't take credit
08-08-2010, 01:16 PM
 #9

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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