Free step-by-step calculator

One calculator. A clearer way through.

Choose a labeled calculator, enter the problem in familiar notation, and follow the method one step at a time.

12 calculator modesLive LaTeX math inputSteps and practice included
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Math calculatorsGCF uses shared prime factors; LCM uses every required factor

GCF & LCM Calculator

Find the greatest common factor and least common multiple of two or more whole numbers.

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Separate positive whole numbers with commas.

Your explanation will appear here.

Choose a calculator, enter a problem in the formatted math field, then select “Show my steps.”

Learn the method

What this calculator helps you notice

  1. 01Break each number into prime factors
  2. 02Use minimum exponents for the GCF
  3. 03Use maximum exponents for the LCM