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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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15y ago

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9y ago

The factors of 15 and 40 are

15: 1, 3, 5, 15

40: 1, 2, 4, 5, 8, 10, 20, 40

GCF : 5

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Q: What is the GCF of 15 and 40?
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