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Prime Factors Worksheet

A Grade 7 math worksheet focusing on identifying prime numbers, finding prime factors, and using factor trees.

Grade 7 Math Number SensePrime Factors
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Includes

Multiple ChoiceFill in the Blanks2 Short AnswerCustomTrue / False

Standards

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

Topics

mathgrade 7prime factorsnumber sensefactor tree
8 sections · Free to use · Printable
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Prime Factors Practice

Name:

Date:

Score:

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

1. Which of the following is a prime number?

a

9

b

15

c

23

d

27

2. What is the smallest prime factor of 30?

a

1

b

2

c

3

d

5

3. A prime number is a natural number greater than 1 that has no positive divisors other than 1 and  .

4. The process of finding the set of prime numbers which multiply together to give the original number is called  .

5. List all the prime numbers between 10 and 20.

6. Complete the factor tree for the number 48.

4822421226

Write the prime factorization of 48:  

7. The number 1 is a prime number.

T

True

F

False

8. Find the prime factorization of 72 using any method you prefer. Show your work.