The factors of 27 are: 1, 3, 9, 27
The factors of 36 are: 1, 2, 3, 4, 6, 9, 12, 18, 36
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The common factors of 36 and 27 are 1, 3 & 9; the highest common factor is 9.
The factors of 108 are 1, 2, 3, 4, 6, 9, 12, 18, 27, 36, 54, and 108.
45
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The GCF is 9.