List the factors.
1, 2, 5, 10
1, 3, 5, 15
5 is the largest number that appears on both lists.
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The GCF is 5.
The GCF is 5.
Since 15 is a factor of 60, it is automatically the GCF.
You need at least two numbers to find a GCF.
The GCF of 10 and 15 is 5.