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 3 are 1 and 3.
The factors of 4 are 1, 2, and 4.
The only common factor is 1.
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4 and 9 share no common factors aside from 1. 4 = 2 x 2 9 = 3 x 3
The factors of 9 are 1, 3, and 9. The factors of 12 are 1, 2, 3, 4, 6, and 12. The common factors are 1 and 3.
The common factors of 24 and 420 are: 1, 2, 3, 4, 6, and 12
The factors of 3 are: 1, 3The factors of 12 are: 1, 2, 3, 4, 6, 12The common factors are: 1, 31 and 31 and 3
The factors of 4 are 1, 2, and 4. The factors of 6 are 1, 2, 3, and 6. The common factors are 1 and 2.