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Worksheets for the greatest common factor (GFC) and least common multiple (LCM) of numbers

You can create free printable worksheets for finding the greatest common factor (GFC) and least common multiple (LCM) of up to 6 different numbers. The worksheets can be made in PDF or html formats, and are customizable with lots of options: you can choose the number ranges for the GCF and LCM separately, the number of problems, workspace, font size, border, and border color. You can also make worksheets with mixed problems, including some for both GCF and LCM.

NOTE: The largest number allowed for GCF is 1,000,000 and for LCM 10,000 to be safe (to reduce the server load).

Basic instructions for the worksheets

Each worksheet is randomly generated and thus unique. The answer key is automatically generated and is placed on the second page of the file.

You can use the generator to make worksheets either in html or PDF format — both are easy to print. The html worksheet has the advantage that you can save it directly from your browser (choose File → Save) and then later edit it in Word or other word processing program.

Ready-made worksheets

Here are some quick links for ready worksheets. Refresh the worksheet page to get another of the same kind, until you are happy with the problems & layout.

Worksheet Generator - GCF / LCM

Columns:   Rows:
(These determine the number of problems)

Find the greatest common factor (GCF); range from to

Find the least common multiple (LCM); range from to

How many numbers? Find the GCF or LCM of numbers.

Number of empty lines below the problem (workspace)
Page orientation:
Portrait   Landscape
(PDF worksheet only; the orientation of an html worksheet can be set in the print preview of the browser)

Font:   Font Size: 

Cell Padding:    

Border:     Bordercolor:

Additional title & instructions  (HTML allowed)


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