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One because thirteen is a Prime number meaning that only on and itself goes into this number. Seince 13 does not go into 15 the GCF has to be one. (That is the only number that goes into both.)
The GCF is 1.
It is: 1

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8y ago
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12y ago

You probably want the "gcf". It's ' 1 '.

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13y ago

The GCF is: 1

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13y ago

GCF of 13 and 15 is 1.

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Q: What is the greatest common factor of 15 and 13?
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