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Prime and Composite Numbers Worksheet

Explore prime and composite numbers with this comprehensive worksheet for 8th graders, featuring identification, classification, and reasoning questions.

Grade 8 Math Number SenseNumber TheoryPrime and Composite Numbers
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Includes

Multiple ChoiceFill in the BlanksTrue / FalseShort AnswerCustomMatching

Standards

CCSS.MATH.CONTENT.6.NS.B.4

Topics

prime numberscomposite numbersnumber theorygrade 8 math
8 sections · Free to use · Printable
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Prime and Composite Numbers

Name:

Date:

Score:

Read each question carefully and answer to the best of your ability. Show all your work where applicable.

1. Which of the following is a prime number?

a

51

b

57

c

61

d

65

2. All even numbers greater than 2 are:

a

Prime

b

Composite

c

Both prime and composite

d

Neither prime nor composite

3. A prime number has exactly   factors.

4. The number 1 is neither prime nor  .

5. A composite number has   than two factors.

6. The number 2 is the only even prime number.

T

True

F

False

7. All odd numbers are prime numbers.

T

True

F

False

8. List all prime numbers between 20 and 40.

9. Explain why 49 is a composite number.

10. On the number line below, circle all the prime numbers and put a square around all the composite numbers between 1 and 10.

12345678910

Match each number to its correct classification.

11. 13

 

a. Composite Number

12. 25

 

b. Prime Number

13. 37

 

c. Neither Prime nor Composite

14. 1

 

d. Even Composite Number