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Best Answer

The factors of 28 are:

1, 2, 4, 7, 14, 28

The factors of 78 are:

1, 2, 3, 6, 13, 26, 39, 78

The common factors are:

1, 2

The Greatest Common Factor (GCF) is: 2

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11y ago
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13y ago

The greatest common factor of 28 and 20 is 4.

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9y ago

The greatest common factor of the numbers 420 and 28 is 28.

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12y ago

The answer is 4. :)

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Wiki User

11y ago

The GCF is 4.

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9y ago

The GCF is 2.

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8y ago

The GCF is 4.

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Wiki User

8y ago

The GCF is 4.

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Wiki User

10y ago

It is: 4

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Q: What is the GCF of 20 28 36?
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