Prime Factors Worksheet
A Grade 4 math worksheet focusing on identifying prime numbers and finding prime factors of composite numbers.
Includes
Standards
Topics
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?
4
9
11
15
2. Which number is NOT a prime number?
2
7
13
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.
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