Reflection: Checks for Understanding Prime and Composite Numbers - Section 4: Closure


In this particular lesson, the students had to find the factors of numbers using counters.  The students had to tell if the number was prime or composite.  Based upon the student work and conversation as I walked around the room, I found that the counters were helpful to the students.  

This gave the students something tangible to move around.  I find that having a tangible item sometimes give students more confident in working on new skills. As I walked around to monitor, the classroom buzzed with excitement.  (Students always seem to be excited when they work with manipulatives in groups.) Some students had difficulty with finding all of the factors for the numbers.  They could find some factors.  

The students found that having the counters did not ensure that they could find all factors.  The students realized that they had to use some of the patterns learned for numbers as well.  For example, for even numbers, they knew that 2 would be a factor.  For multiples of 10, they knew that 2, 5 or 10 could be a factor.  

I feel that the lesson was successful because knowledge was gained.


  Using Tangible Items in Math
  Checks for Understanding: Using Tangible Items in Math
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Prime and Composite Numbers

Unit 12: Multiplying and Dividing
Lesson 23 of 23

Objective: SWBAT identify numbers as prime or composite by using multiplication facts to find the factors.

Big Idea: Knowing multiplication facts can help students identify numbers as prime or composite.

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  50 minutes
prime and composite
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