Greatest Common Factor Worksheet
Find the greatest common factor of each pair of numbers — the largest number that divides both.
- Free, no sign-up
- No AI — answers are calculated, not guessed
- Made in your browser, nothing uploaded
Example worksheets
Made with this tool — click any example to see it full size.
Best for: Grades 5–6
Two quick methods
List the factors of both numbers and pick the largest shared one, or use prime factorization and multiply the shared primes.
Make it a timed challenge
Put a visual classroom timer on the board and see how many problems students can finish before the time runs out. Print a new version tomorrow and try to beat the score.
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Frequently asked questions
Is GCF the same as GCD or HCF?
Yes — greatest common factor, greatest common divisor and highest common factor are the same thing.
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