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You write down all of both number's factors and find the biggest number that they share.

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Example: 30 and 42

Factor them.

2 x 3 x 5 = 30

2 x 3 x 7 = 42

Select the common factors.

2 x 3 = 6, the GCF

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8y ago

Example: 30 and 42

Factor them.

2 x 3 x 5 = 30

2 x 3 x 7 = 42

Select the common factors.

2 x 3 = 6, the GCF

This answer is:
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Q: How can you find the greatest common factor of two number?
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What is the greatest common factor of 1440?

There cannot be a greatest common factor of just one number. To be common there need to be at least two numbers. If you find all the factors of two or more numbers, and you find some factors are the same ("common"), then the largest of those common factors is the Greatest Common Factor.


What is the greatest common factor of 196 and 1078?

196: 2-2-2-2-11 1078: 2-7-7-11 Greatest common factor: 22 Method(s) used: # The method to find the greatest common factor of numbers is to find the prime factorizations of each one, select all matching prime factors, and then multiply. # An alternative method is to find all of the factors of each, and then select the greatest number that appears in each list. # The final method only applies to some numbers; if one of the number is a factor of the other, then that number is the greatest common factor. This is because all numbers are factors of themselves, and that is their greatest factor. If it is also a factor of the other number, then it is definitely the greatest common factor.


What are the numbers for the greatest common factor of 4?

You need at least two numbers to find a GCF. 8 and 12 have a GCF of 4.


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You need at least two numbers to find a greatest COMMONFactor.The greatest COMMON factor for 171 will depend upon the other number(s) with which it has COMMON factors, but it WILL be one of the factors of 171, namely one of: 1, 3, 9, 19, 57, 171


What is the greatest common factor of45 and 75?

There cannot be a greatest common factor (GCF) of just one number. To be common there need to be at least two numbers. If you find all the factors of two or more numbers, and you find some factors are the same ("common"), then the largest of those common factors is the Greatest Common Factor.

Related questions

Find a greatest common factor of 144?

There is no Greatest Common Factor (GCF) for a single number. The Greatest Common Factor (GCF) is the largest factor common to two or more given numbers.


How do you find the greatest common factor of a set of numbers?

The greatest common factor (or GCF) is the highest number that can divide into aanother number, and not have a decimal (whole number).


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There are no common or greatest common factor(s) of just one number. In order to find the common or greatest common factor(s) you need two or more numbers.


What are the common factors and greatest common factor of 119?

There cannot be a greatest common factor of just one number. To be common there need to be at least two numbers. If you find all the factors of two or more numbers, and you find some factors are the same ("common"), then the largest of those common factors is the Greatest Common Factor.


What is the greatest common factor of 96?

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What is the greatest common factor of 340?

To find a Greatest common Factor we need two numbers , Please give second number.


What is the greatest common factor of a number?

There cannot be a greatest common factor of just one number. To be common there need to be at least two numbers. If you find all the factors of two or more numbers, and you find some factors are the same ("common"), then the largest of those common factors is the Greatest Common Factor.


How can you get the greatest common factor of a number?

There cannot be a greatest common factor of just one number. To be common there need to be at least two numbers. If you find all the factors of two or more numbers, and you find some factors are the same ("common"), then the largest of those common factors is the Greatest Common Factor.


What is the greatest common factor 42 a?

You need at least two numbers to find a GCF.


What are the greatest common factors of 62?

There are no common or greatest common factor(s) of just one number. In order to find the common or greatest common factor(s) you need two or more numbers.


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.


What is the greatest common factor of 19.7 million?

You need at least two numbers to find a GCF.