Prime & Composite Numbers Everyday Math Lesson 1.6

Lesson Objectives I can define and classify prime and composite numbers. I can find the factors of a number.

Mental Math 3 x 6= 7 x 5= 9 * 8= 4 x 4= 6 * 5= 9 * 4= 4 x 8= 6 * 9= 8 * 9= 5 x 3= 7 x 4= 9 * 7= 8 x 5= 6 x 8= 10 x 5=

Vocabulary Add the following words to your vocabulary chart: Composite number Prime number

Math Message Draw all possible rectangular arrays for these numbers: 2,4, 5, 10, 11, and 12 in your Work Journal. Today’s Math Message will be used as a formative assessment check. I will make a vertical line on the board and put 4, 10, and 16 on the right hand side, and 2. 5. and 11 on the left had side.Students will share their answers along with the Factor Rainbows for each number, we will check each one as a class. We will use our display on the board for the next part of the lesson.

Defining Prime and Composites Let’s compare the numbers from our math message. What do you notices about the right side of our display and the left side of our display? Write your ideas on the same page that your did your Math Message.

Defining Primes and Composites (cont.) Each number on the right side has exactly two arrays. Each number on the left side has more than two arrays. Each number on the right has exactly 2 factors. Each number on the left has more than 2 factors. I will allow students to share their thoughts before pointing out the main concepts of this activity. Students should notice some of the same concepts while reflecting in their Work Journals.