You need at least two numbers to find a GCF.
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The GCF of 36 and 18 is 18.
Since 18 is a factor of 36, it is automatically the GCF.
Since 36 is a factor of 108, all of its factors are common.
No, 18 is.
The GCF of 18, 36, and 80 is 18. Since 18 is a factor of 36 and 80, it is automatically the GCF.