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Short answer: There are none.

There is neither a greatest common factor nor common factors of a single number, such as 81, 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 81 are 1, 3, 9, 27, and 81.

Examples:

The common factors of 18 and 81 are 1, 3, and 9; the greatest common factor is 9.

The common factors of 20 and 81 are only 1; the greatest common factor is 1.

The common factors of 39 and 81 are 1 and 3; the greatest common factor is 3.

The common factors of 81 and 243 are 1, 3, 9, 27, and 81; the greatest common factor is 81.

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8y ago
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Wiki User

15y ago

The prime factors of 45 are 3, 3 and 5

The prime factors of 81 are 3, 3, 3 and 3.

So two 3s are common to both numbers so 3 x 3 = 9 and that is the greatest common factor of the two.

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15y ago

GCD: 9

LCM: 567

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Wiki User

14y ago

9

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Q: What are the greatest common factors of 45 and 81?
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Related questions

What are the greatest common factors in 45 36 81?

9


What are the common factors and greatest common factor of 45 and 81?

The factors of 45 are: 1, 3, 5, 9, 15, 45The factors of 81 are: 1, 3, 9, 27, 81The common factors are: 1, 3, 9The Greatest Common Factor (GCF) is: 9


What is the greatest common factor of 45 63 and 81?

Factors of 45: 1 3 5 9 15 45 Factors of 81: 1 3 927 81 Factors of 63: 1 3 7 9 21 63 The GCF of 45, 81, and 63 is 9


What is the gcf for 45 81?

The factors of 45 are: 1, 3, 5, 9, 15, 45The factors of 81 are: 1, 3, 9, 27, 81The common factors are: 1, 3, 9The Greatest Common Factor (GCF) is: 9


What is the greatest common factor of 45 81 and 99?

The greatest common factor is 9


What is the Greatest Common Factor of 45 and 81?

The greatest common factor of 81 and 45 is 9Factors of 45: 1 3 5 9 15 45Factors of 81: 1 3 9 27 81The GCF of 45 and 81 is 9It is: 9


What is the greatest common factor of 45 81 and 90?

GCF (45, 81, 90) = 9


What is greatest common factor of 81 and 135?

Factors of 81: 1, 3, 9, 27, 81 Factors of 135: 1, 3, 5, 9, 15, 27, 45, 135 GCF (81, 135) = 27


What are the greatest common factors of 81 135?

Factors of 81: 1, 3, 9, 27, 81Factors of 135: 1, 3, 5, 9, 15, 27, 45, 135GCF (81, 135) = 27


What is the greatest common factor of 81 and 135?

The GCF of 81 and 135 is 27.81= 1x81,3x27 135= 1x135, 5x27The factors of 81 are:1, 3, 9, 27, 81The factors of 135 are:1, 3, 5, 9, 15, 27, 45, 135The common factors are:1, 3, 9, 27The Greatest Common Factor:GCF = 27


What is the greatest common factor of 45 81 63?

The GCF is 9.


What Are the common factors for 45 and 81?

They are 1 and 9