Greatest Common Factor (GCF) Worksheet
Practice finding the greatest common factor (GCF) of two or more numbers with this Grade 5 math worksheet.
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Greatest Common Factor (GCF) Practice
Name:
Date:
Score:
Read each question carefully and find the greatest common factor (GCF) for the given numbers. Show your work where indicated.
1. Find the GCF of 12 and 18.
2. What is the GCF of 24 and 36?
3. The factors of 15 are 1, 3, , and 15.
4. The GCF of 10 and 20 is .
5. Which of the following is the GCF of 8 and 20?
2
4
8
20
6. The GCF of two prime numbers is always 1.
True
False
7. Explain how to find the GCF of 16 and 40 using prime factorization.
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