1, 3, 9, and 27
The common factors of 45 and 108 are: 1, 3 & 9.
The common factors of 81 and 108 are: 1, 3, 9, and 27
The factors of 972 are 1, 2, 3, 4, 6, 9, 12, 18, 27, 36, 54, 81, 108, 162, 243, 324, 486, 972 For them to be common, they need to be compared to another set of factors.
There cannot be a common factor of just one number. To be common, there needs to be at least two numbers; howver, the factors of 243 are 1, 3, 9, 27, 81, and 243.
The factors of 81 are 1, 3, 9, 27, and 81. The factors of 243 are 1, 3, 9, 27, 81, and 243. The common factors of 81 and 243 are 1, 3, 9, 27, and 81. Therefore, the least common factor (the smallest common factor) is 1.
The common factors of 24 and 108 are: 1, 2, 3, 4, 6, and 12
The common factors of 81, 108, and 162 are: 1, 3, 9, and 27
The highest common factor of 108 and 45 is 9
Since 18 is a factor of 108, all of its factors are common, i.e. 1,2,3,6, 9 and 18.
108/243 = 4/9
The common factors of 108 and 756 are 1, 2, 3, 4, 6, 9, 12, 18, 27, 36, 54 and 108.
Since 54 is a factor of 108, all of 54's factors are common and the GCF is 54 itself.