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GCF and LCM mixed practice worksheets Grades 4–5

Mixed greatest common factor and least common multiple problems. Read each one carefully.

The front of the free gCF and LCM mixed practice worksheet
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Free · Worked example · 28 problems · Answer key · US Letter

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How to do it

Read carefully: GCF or LCM?

GCF of 62 and 28=2\text{GCF of }62\ \text{and }28 = 2
62:1,2,31,6262: 1, 2, 31, 62
28:1,2,4,7,14,2828: 1, 2, 4, 7, 14, 28
Largest factor in both lists: 2\text{Largest factor in both lists: }2

Example problems

  1. GCF of 11 and 55=\text{GCF of }11\ \text{and }55 =
  2. LCM of 10 and 12=\text{LCM of }10\ \text{and }12 =
  3. GCF of 51 and 54=\text{GCF of }51\ \text{and }54 =
  4. GCF of 90 and 69=\text{GCF of }90\ \text{and }69 =

Factors, multiples and prime numbers

  1. Divisibility rules
  2. Factor pairs
  3. Listing factors
  4. Prime and composite numbers
  5. Prime factorization
  6. Greatest common factor (GCF)
  7. Least common multiple (LCM)
  8. GCF and LCM mixed practice