Prime and Composite Numbers
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Subject Area: Mathematics (B.E.S.T.) | Grade Level: 4
Lesson Length: 15 minutes or less
Keywords/Tags: Prime and Composite Numbers
Lesson Description: In this lesson, students will determine if a number is a prime or composite number.

  • Other 4.PAR.3: Generate and analyze patterns, including those involving shapes, input/output diagrams, factors, multiples, prime numbers, and compositernnumbers.
  • Other • 4.PAR.3.3 Find factor pairs in the range 1-100 and find multiples of single-digit numbers up to 100.
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Video : Sieve of Eratosthenes
Instructions: Please watch the following video as many times as needed before starting to go through other lesson pages. Understanding the content of the video is very important since the lesson activities will be all about this video content.
Description: Watch this video to help you understand how to find Prime numbers using a hundreds chart.
Reading : Prime vs. Composite numbers
Instructions: Read over the vocabulary for prime and composite and examples before taking your quiz.

Prime numbers are only two factors 1 and itself. Just think of PR1ME (one and me) 

Examples:

5 is a prime number because it only has two factors 1 and 5 (1 x 5) 

13 is a prime number because its only factors are 1 and 13 (1 x 13)

 

Composite numbers are numbers with more than two factors. 

Examples: 

12 - 1 x 12, 2 x 6, 3 x 4 - The factors for 12 are 1, 2, 3, 4, 6, 12  The number 12 has 6 factors making this a composite number. 

15- 1 x 15, 3 x 5- The factors for 15 are 1, 3, 5, 15. This number has 4 factors so it is a composite number. 

Description: I've included the vocabulary and examples for Prime and Composite to give you a better understanding.
Quiz : Prime and Composite Quiz
Instructions: Please complete this quiz by choosing the correct answer for each question. You can take this quiz as many times needed.
Question #1

Which number is a composite number between 1 and 10? 

Question #2

Which number is a prime number between 20 and 30? 

Question #3

Which number is a composite number between 80 and 100?

Question #4

Which number is a composite number between 60 and 80?

Question #5

Which number is a prime number between 80 and 90? 

Question #6

Is 96 a prime or composite or neither? 

Question #7

Is 1 a prime, composite or neither? 

Question #8
75 is a prime number 
Question #9
17 is a prime number. 
Question #10
List the factors of 16.  Is it a Prime or Composite number? Explain how you know. 
Resources : Prime and Composite numbers
Instructions: Please see additional external resources below. Feel free visit each link to learn more about this lesson.
Prime Number Song
This song is a fun way to remember prime numbers.
What is a prime number?
This is a way to learn more about prime numbers with larger numbers.
Prime and Composite Fruit Game
Splat each fruit based on being a prime or composite number. Be sure to challenge yourself.
Description: These resources will help you explore more ways to learn prime and composite numbers.