The GCF is 3.
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The greatest factor of 21 and 16 is 21, which is a factor of 21 but not of 16.
Answer: 3Definition: 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 the numbers have in common.Method: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 15 are 1, 3, 5, and 15.The factors of 21 are 1, 3, 7, and 21.The factors of 27 are 1, 3, 9, and 27.The common factors are 1 and 3. Therefore, the greatest common factor is 3.
The greatest common factor of 21 and 75 is 3.
The greatest common factor of 21 and 322 is 7.
The greatest common factor of 105 and 147 is 21