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Because 3 is the largest number that divides into both 12 and 15 evenly with no remainder.
The GCF is 3.
GCF(15, 12, 45) = 3
The GCF of 9, 12, 15 is 3.
The GCF of 12 and 15 is 3.
The GCF is: 3
The GCF of 15 and 12 is: 3
GCF(12, 15, 18) = 3
3 and 60, respectively.