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Q: What is the greatest common factor of 51 and 20?

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The GCF is 1.

Short answer: There are none. There is neither a greatest common factor nor common factors of a single number, such as 459, 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. The factors of 459 are 1, 3, 9, 17, 27, 51, 153, and 459. Examples: The common factors of 18 and 459 are 1, 3, and 9; the greatest common factor is 9. The common factors of 102 and 459 are 1, 3, 17, and 51; the greatest common factor is 51. The common factors of 144 and 459 are 1 and 3; the greatest common factor is 3.

The factors of 4: 1, 2, 4 The factors of 51: 1, 3, 7, 51 GCF=1

The factors of 51 are:1, 3, 17, 51The factors of 85 are:1, 5, 17, 85The common factors are:1, 17The Greatest Common Factor:GCF = 17

3

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The greatest common factor is 51

What is the greatest common factor shared by 51 and 21?

the greatest common factor of 51 and 34 is 17 because 17 is a factor of both 51 and 34 and it happens to be the greatest.

Greatest common factor of 20 & 51 is 1. Factors of 20 are 1, 2, 4, 5, 10 & 20. Factors of 51 are 1, 3, 17 & 51. The only common factor is 1, so GCF is 1. Alternate method: Prime factorization of 20 = 2x2x5 Prime factorization of 51 = 3x17 From the prime factorizations it is clear that 1 is the GCF of 20 and 51.

The Greatest Common Factor of 39, 48, 51: 3

The greatest common factor of 9, 18, and 51 is 3

Greatest common factor for 102 and 357 is 51.

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