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A factor is a divisor - a number that will evenly divide into another number. The greatest common factor of two or more numbers is the largest factor that both numbers have in common.

One way to determine the common factors and greatest common factor is to find all the factors of the numbers and compare them.

The factors of 105 are 1, 3, 5, 7, 15, 21, 35, and 105.

The factors of 120 are 1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 20, 24, 30, 40, 60, and 120.

The common factors are 1, 3, 5, and 15. Therefore, the greatest common factor is 15.

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15y ago

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Wiki User

9y ago

The GCF is 15.

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Wiki User

10y ago

GCF(120, 105) = 15.

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Q: What is the greatest common factor of 105 and 120?
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