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You need at least two numbers to find a GCF. If that's 4 and 80, the GCF is 4.

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Q: What is the greatest common factor of 480?
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What are the common factors and greatest common factor of 480?

Short answer: There are none. There is neither a greatest common factor nor common factors of a single number, such as 480, because there cannot be any form of common factor without two or more numbers to compare. Common factors are factors that the numbers being compared have in common. The greatest common factor is the largest factor that all the numbers being compared have in common. Thus, since there are not two or more numbers to compare, there are neither common factors nor a greatest common factor. Examples: The common factors of 13 and 480 are only 1; the greatest common factor is 1. The common factors of 81 and 480 are 1 and 3; the greatest common factor is 3. The common factors of 158 and 480 are 1 and 2; the greatest common factor is 2. The common factors of 380 and 480 are 1, 2, 4, 5, 10, and 20; the greatest common factor is 20. The common factors of 480 and 492 are 1, 2, 3, 4, 6, and 12; the greatest common factor is 12.


What is the greatest common factor for 480 and 640?

The GCF is 160.


What is the greatest common divisor of 150 and 480?

The Greatest Common Divisor of 150, 480 is 30.


24 is the greatest common factor of what number?

24 is not the greatest common factor of any single number. Common factors are the factors that two or more numbers have in common. The greatest common factor is the largest factor that two or more numbers have in common. There cannot be any common factors or a greatest common factor of a single number. There must be at least two number for common factors and a greatest common factor. Example: The greatest common factor of 24 and 48 is 24. The greatest common factor of 60 and 144 is 24. The greatest common factor of 240 and 264 is 24.


Why is there no Least Common factor if there is Greatest Common Factor?

The least common factor is always one (1), regardless of what the greatest common factor is.