The common factors of 30 and 63 are 1 and 3.
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The common factors of 28 and 63 are: 1 and 7
The common factors of 54 and 63 are: 1, 3, and 9
The common factors of 45 and 63 are 1, 3, and 9.
The factors of 27 are 1, 3, 9, and 27. The factors of 63 are 1, 3, 9, 7, 21, and 63. The common factors of 27 and 63 are 1, 3, and 9.
The greatest common factor of 45 and 63 is 9.