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Anonymous
A single number cannot have a greatest common factor because "common" refers to factors that two or more numbers have in common. You have only one number.
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The factors of 15 and 40 are
15: 1, 3, 5, 15
40: 1, 2, 4, 5, 8, 10, 20, 40
GCF : 5
The GCF is 5.
GCF of 40 and 64 is 8.
GCF of 40 and 125 is 5.