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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The greatest common factor of 15 and 105 is 15.
Since 15 is a factor of 60, it is automatically the GCF.
The greatest common factor (GCF) is: 5.
Since 5 is a factor of 15, it is automatically the greatest common factor of the pair.
The greatest common factor of 135 and 300 is 15.