Grade 5 Prime Factors Worksheet
A worksheet for 5th graders to practice identifying prime numbers and finding prime factors of composite numbers.
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Prime Factors Practice
Name:
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?
9
15
13
21
2. Which of the following is a composite number?
2
7
17
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.
True
False
8. Every composite number can be written as a product of prime numbers.
True
False
9. Find the prime factorization of 60.
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