Since 15 is a factor of 45, it is automatically the GCF.
The GCF is 15.
5
The GCF is 9.
The GCF is 5.
The GCF is 9.
The GCF is 1.
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15
GCF: 9 LCM: 180
30/45 = 2/3 in its reduced terms
The GCF is 30.
The GCF is 30.