The GCF is 1.
The GCF is 4.
The GCF is 3.
The GCF is 3.
5 is the GCF of 15 and 40.
The GCF of 20 and 40 is 20 The GCF of 15 and 30 is 15 The GCF of 15, 20, 30 and 40 is 5.
The GCF of 12 and 15 is 1
The GCF is 3.
The GCF is 1.
The GCF is 5.
The GCF is 5.
The GCF is 5.
GCF(15, 12, 45) = 3