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The factors of 30 are 1, 2, 3, 5, 6, 10, 15, and 30.
The factors of 18 are 1, 2, 3, 6, 9, and 18.
The factors that are on both lists ... the "common" factors ... are 1, 2, 3, and 6 .
The greatest one of those is 6 .
Why do I have this nagging feeling that you're not completely sure of
what "GCF" stands for, or how to go about finding it ?
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