# What is the greatest common factor of 4 and 10?

The greatest common factor is 2.

Now compare the two lists again to see if any of the numbers are the same. If so, the greatest number will be the greatest common factor; since there is only one common number in this case—2, it is the greatest common factor by default.

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The GCF = 2.

Both 4 and 10 are even, so they must have a common factor of 2.

In this case this is the only common factor (apart from 1).

Write each number as the product of its prime factors if the question involves factors, GCF, LCM, or roots.

You have complete knowledge about a number if it is expressed as the product of its prime factors!

This method works well for determining the LCM as well, particularly for large numbers.

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The greatest common factor (GCF) of 4 and 10 is 2.

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