The common factors are: 1, 3, 9.
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The factors of 45 are: 1, 3, 5, 9, 15, 45The factors of 81 are: 1, 3, 9, 27, 81The common factors are: 1, 3, 9The Greatest Common Factor (GCF) is: 9
1, 3 and 9 are common factors of 27, 45 and 81. 27, 45 and 81 are multiples of 1, 3 and 9.
The factors of 81 are: 1, 3, 9, 27, 81The factors of 90 are: 1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 45, 90The common factors are: 1, 3, 9
The factors of 81 are 1, 3, 9, 27, 81. For them to be common, they need to be compared to another set of factors.
GCF (45, 81, 90) = 9