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They aren't. The GCF of 18 and 21 is 3.

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9y ago

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Related Questions

Can there be 2 greatest common factors?

No. The greatest common factor of any two or more numbers is always the single highest common factor.


Why does the listing method always works to find the greatest common factor?

The greatest common factor of two numbers has to show up on the lists of factors of both numbers.


Common factors and greatest common factors?

they are closely related, but GCF (greatest common factor) is the largest common factor between two or more numbers.


What is the term for the greatest of the common factors of two or more numbers?

The greatest of the common factors of two or more numbers is the GCF


What is the greatest common factor of the numbers?

All numbers have factors. Some numbers have some of the same factors as other numbers. These are known as common factors. The largest of these is known as the greatest common factor, or GCF.


Is great of common factors or more numbers called?

The greatest of common factors of two or more numbers is called the greatest common factor, or GCF.


When the greatest common factor is 1 is the least common multiple of these numbers always the product of the numbers?

Yes - if two numbers share no common factors (besides 1) the least common multiple will be the product of the numbers.


What does it mean to find the greatest common factor of to numbers?

All numbers have factors. Some numbers have some of the same factors as other numbers. These are known as common factors. The largest of these is known as the greatest common factor, or GCF.


How does the greatest common factor relate two or not whole numbers?

All numbers have factors. Some numbers have some of the same factors as other numbers. These are known as common factors. The largest of these is known as the greatest common factor, or GCF.


What does it mean to find the greatest common factor?

All numbers have factors. Some numbers have some of the same factors as other numbers. These are known as common factors. The largest of these is known as the greatest common factor, or GCF.


What are the the greatest common factors of 9?

It is meaningless to ask "What are the greatest common factor of 9". There should be two or more numbers. Greatest common factor means the greatest number which is the common factor of all the numbers mentioned.


Why do you have greatest common factor and not least common factor?

The least (meaning lowest) common factor of any set of whole numbers is always 1. The greatest common factor of any set of whole numbers will depend on the factors of the individual whole numbers in the set.