1,3,9 and27
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Factors are numbers you can multiply together to get another number. 81: 1, 3, 9, 27, 81
1, 3, 9, 27
The GCF is 9.
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 18 are 1, 2, 3, 6, 9, and 18. The factors of 27 are 1, 3, 9, and 27. The factors of 81 are 1, 3, 9, 27, and 81. The common factors are 1, 3, and 9. Therefore, the greatest common factor is 9.
To find the common factors of 27 and 108, you should first break them down into their prime factors: 27 = 3x3x3 108 = 2x2x3x3x3 The next step is to identify any common factors. In this case, both numbers have three 3s as prime factors. Thus any product combination of these will give a number that is a common factor of 27 and 108. Thus the numbers that go into 27 and 108 are: 1, 3, 9 and 27.