LCM and HCF Worksheet Generator

Practice the highest common factor (HCF, also called GCF or GCD) and the lowest common multiple (LCM). Choose one or both, pick a level from numbers under 20 up to three-number challenges, add working space for listing factors, and print straight from your browser with an optional answer key. Tuned for 4th through 6th grade.

FindLevelCall itProblems on page: 12Working space under each problem (for listing factors or multiples)Include an answer key on a second page

Every problem has a real answer to find: the HCF is never 1 and never one of the numbers itself, and above the easy level no number is a multiple of another, so the LCM is never just the bigger number. Challenge sheets mix in three-number problems.

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HCF and LCM Worksheeteasy

HCF = highest common factor: the largest number that divides into every number in the set. LCM = lowest common multiple: the smallest number that every number in the set divides into. Write each answer in the box.

1HCF(10, 15)=

2LCM(12, 20)=

3HCF(8, 20)=

4LCM(12, 16)=

5HCF(15, 20)=

6LCM(6, 20)=

7HCF(8, 10)=

8LCM(6, 15)=

9HCF(6, 9)=

10LCM(6, 10)=

11HCF(9, 15)=

12LCM(10, 12)=