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.
Readymade 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.
 Find the greatest common factor of 2 numbers between 1 and 50 (easy)
 Find the greatest common factor of 2 numbers between 1 and 100
 Find the greatest common factor of 3 numbers between 1 and 100
 Find the least common multiple of 2 numbers between 2 and 30
 Find the least common multiple of 2 numbers between 2 and 50
 Find the least common multiple of 3 numbers between 2 and 30
Worksheet Generator  GCF / LCM 
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:

Additional title & instructions (HTML allowed) 
Brain Quest Workbook: Grade 6
The book boasts 300 pages jampacked with curriculumbased activities and exercises in every subject, with a focus on math and language arts. Original fullcolor illustrations throughout give the book a bright, lively style that will appeal to older kids. It is engaging, userfriendly, and written to make schoolwork fun. Sixth graders will delve into research and analysis, metaphor and meaning, ratios and proportions, expressions and equations, and geometry. The workbook covers spelling and vocabulary, writing, social studies, science, and more.