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Grade 5 Prime Factors Worksheet

A worksheet for 5th graders to practice identifying prime numbers and finding prime factors of composite numbers.

Grade 5 Math Number SensePrime Factors
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Includes

TextMultiple ChoiceFill in the Blanks2 Short AnswerCustomTrue / False

Standards

CCSS.MATH.CONTENT.4.OA.B.4

Topics

mathgrade 5prime factorsnumber sense
9 sections · Free to use · Printable
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Prime Factors Practice

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Date:

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

What is a Prime Number?

A prime number is a whole number greater than 1 that has only two factors: 1 and itself.

What is a Composite Number?

A composite number is a whole number greater than 1 that has more than two factors.

1. Which of the following is a prime number?

a

9

b

15

c

13

d

21

2. Which of the following is a composite number?

a

2

b

7

c

17

d

18

3. The only even prime number is  .

4. The prime factors of a number are all   numbers.

5. List all the prime numbers between 1 and 20.

6. Find the prime factorization of 24 using a factor tree. Draw your factor tree below.

Prime factorization of 24:  

7. The number 1 is a prime number.

T

True

F

False

8. Every composite number can be written as a product of prime numbers.

T

True

F

False

9. Find the prime factorization of 60.