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Integers and factors · Grades 5 to 6

Greatest common factor worksheet generator

This generator makes greatest common factor worksheets with pairs of numbers up to 30, 60 or 100. The answer key gives the GCF of each pair.

Greatest common factorLetter 8.5 × 11 in · answer key on the last page
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Greatest common factor
NameDate

Find the greatest common factor (GCF) of each set of numbers.

  1. 1.GCF(12, 24) =
  2. 2.GCF(45, 12) =
  3. 3.GCF(36, 60) =
  4. 4.GCF(48, 4) =
  5. 5.GCF(56, 21) =
  6. 6.GCF(30, 55) =
  7. 7.GCF(30, 36) =
  8. 8.GCF(30, 50) =
  9. 9.GCF(28, 36) =
  10. 10.GCF(18, 54) =
  11. 11.GCF(36, 12) =
  12. 12.GCF(20, 44) =
  13. 13.GCF(50, 60) =
  14. 14.GCF(55, 33) =
  15. 15.GCF(33, 44) =
  16. 16.GCF(24, 12) =
  17. 17.GCF(24, 45) =
  18. 18.GCF(60, 40) =
  19. 19.GCF(8, 24) =
  20. 20.GCF(22, 11) =
nation1.netSheet 77227259
Greatest common factor
Answer key
  1. 1.GCF(12, 24) =12
  2. 2.GCF(45, 12) =3
  3. 3.GCF(36, 60) =12
  4. 4.GCF(48, 4) =4
  5. 5.GCF(56, 21) =7
  6. 6.GCF(30, 55) =5
  7. 7.GCF(30, 36) =6
  8. 8.GCF(30, 50) =10
  9. 9.GCF(28, 36) =4
  10. 10.GCF(18, 54) =18
  11. 11.GCF(36, 12) =12
  12. 12.GCF(20, 44) =4
  13. 13.GCF(50, 60) =10
  14. 14.GCF(55, 33) =11
  15. 15.GCF(33, 44) =11
  16. 16.GCF(24, 12) =12
  17. 17.GCF(24, 45) =3
  18. 18.GCF(60, 40) =20
  19. 19.GCF(8, 24) =8
  20. 20.GCF(22, 11) =11
nation1.netSheet 77227259 ยท answers
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About this worksheet

The GCF is the biggest number that divides both numbers evenly. Students can list factors, or use prime factorization and multiply the primes the two numbers share.

Teaching tip

Connect it to simplifying fractions: dividing the top and bottom by their GCF reduces a fraction in one step.

How to use the generator

Change the settings and the sheet updates as you go. New worksheet gives a fresh set of problems with a new answer key. Print or save PDF opens your browser's print window: pick Letter paper and 100% scale, or Save as PDF to keep a copy.