1. Prime and Composite Numbers
Lesson 11-2
CCSS 4.OA.4
Literature Link: You Can Count on Monsters by Richard Evan Schwartz (second half)

2. MATH Essential Questions
How can the same fractional amount be named using symbols in different ways?
MATH
Essential
Questions

3. MATH Essential Questions
How can fractions be compared and ordered?
MATH
Essential
Questions

4. List all of the factors for the following numbers: 30 14 25
Warm Up
List all of the factors for the following numbers: 30 14 25

5. What factor does every even number have? Explain.
Think and Write
What factor does every even number have? Explain.

6. Let’s look at the Envision Video for this lesson and take the quiz.
Today’s Lesson
In this lesson, you will use factors to identify if a number is prime or composite.
Let’s look at the Envision Video for this lesson and take the quiz.

7. Prime Numbers
A prime number is a number where only two arrays can be made to find its factors. Its ONLY factors are itself and 1.
Example: 2 is a prime number. Its only factors are 1 and 2. No other numbers multiply together to make 2.

8. The number 4 is composite. Its factors are 1, 4, and 2.
Composite Number
A composite number has more than two factors. You can make more than two arrays for that number.
The number 4 is composite. Its factors are 1, 4, and 2.

9. Identify whether the number is prime or composite. List its factors. 7
Practice!
Identify whether the number is prime or composite. List its factors. 7 12 19 21 22 31

10. Problem 1
Mary Jo has 15 strawberry plants for her garden. Can she make more than 2 arrays to group them into equal rows? Explain.

11. Problem 2
Bob’s Berry Farm has 23 blueberry bushes to plant. Can the farmer plant them in more than 2 different ways if he plants them in rows of equal groups? Explain.

12. Problem 3
Farmer Rose has 28 pea plants. Can she make more than 2 arrays to group them into equal rows? Explain.

13. Lesson Wrap Up
In this lesson, you learned how to identify prime and composite numbers.
Reflection: How would you teach a student who was absent about today’s lesson?
Let’s Play the “In Your Prime” Game.
Homework (11-2 Practice) for one “Paw Signature” and (11-2 Reteaching & Practice) if you want two “Paw Signatures.”
Website for Practice: Website for Practice: positegames.php