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A factor is a divisor - a number that will evenly divide into another number. The greatest common factor of two or more numbers is the largest factor that both numbers have in common.
One way to determine the common factors and greatest common factor is to find all the factors of the numbers and compare them.
The factors of 19 are 1 and 19.
The factors of 21 are 1, 3, 7, and 21.
The only common factor is 1. Therefore, the greatest common factor is 1, which means the numbers are relatively prime.
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What is the greatest common factor of 16 and 21?
The greatest factor of 21 and 16 is 21, which is a factor of 21 but not of 16.
What is the greatest common factor of 21 and 75?
The greatest common factor of 21 and 75 is 3.
What is the greatest common factor of 21 and 322?
The greatest common factor of 21 and 322 is 7.
What is the greatest common factor of 105 and 147?
The greatest common factor of 105 and 147 is 21
What are the common factors and greatest common factor of 21 and 42?
The common factors of 21 and 42 are 3, 7 and 21. The greatest common factor (GCF) is 21.
