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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.
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What are the greatest common factors of 102 and 51?
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What is the greatest common factor shared by 51 and 21?
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What is the greatest common factor of 51?
There is not a greatest common factor of 51 because there cannot be a greatest common factor without two or more numbers to compare. Common factors are factors that the numbers being compared have in common.The factors of 51 are 1, 3, 17, and 51.Examples:The greatest common factor of 34 and 51 is 17.The greatest common factor of 51 and 90 is 3.The greatest common factor of 5 and 51 is 1.You need at least two numbers to find a GCF.
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