Home / Worksheets / Grade 4 / Math / Prime Factors Worksheet

Prime Factors Worksheet

A Grade 4 math worksheet focusing on identifying prime numbers and finding prime factors of composite numbers.

Grade 4 Math Number SensePrime Factors
Use This Worksheet

Includes

Multiple ChoiceFill in the Blanks2 Short Answer

Standards

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

Topics

mathgrade 4prime factorsnumber sense
6 sections · Free to use · Printable
← More Math worksheets for Grade 4

Prime Factors Practice

Name:

Date:

Score:

Follow the instructions for each section carefully. Show your work where indicated.

1. Which of the following is a prime number?

a

4

b

9

c

11

d

15

2. Which number is NOT a prime number?

a

2

b

7

c

13

d

21

Read each statement and fill in the blank with 'prime' or 'composite'.

3. The number 5 is a   number.

4. The number 10 is a   number.

5. A number with exactly two factors (1 and itself) is called a   number.

6. List all the factors of 12.

7. List all the factors of 18.

8. Find the prime factors of 20. Show your work using a factor tree or division.

9. Find the prime factors of 24. Show your work using a factor tree or division.