These greatest common factor worksheets are great for practicing finding the Greatest Common Factor of
number sets. Understanding Greatest Common Factors are very important for working with fraction problems.
The problems may be selected from four different number ranges. The easiest keeps the number set
not greater than 24, and the hardest will keep the number sets not greater than 120. These greatest common factor
worksheets will generate 10, 15 or 20 Greatest Common Factor problems per worksheet.