The factors of 21 are: 1, 3, 7, 21.
The factors of 27 are: 1, 3, 9, 27.
The common factors are: 1, 3
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A factor is a divisor - a number that will evenly divide into another number. 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 21 are 1, 3, 7, and 21. The factors of 27 are 1, 3, 9, and 27. The common factors are 1 and 3. This means that the greatest common factor is 3.
The factors of 27 are 1, 3, 9 & 27, while the factors of 125 are 1, 5, 25 & 125, thus the only common factor is 1
Since 21 is a factor of 63, all of its factors are common.
The factors of 189 are: 1 3 7 9 21 27 63 189
They are all factors of 21