1, 3 and 9
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The factors of 36 are: 1, 2, 3, 4, 6, 9, 12, 18, 36 The factors of 63 are: 1, 3, 7, 9, 21, 63 The common factors are: 1, 3, 9
The common factor of 63 and 71 is and 1.
Since 12 is a factor of 36, all of the factors of 12 are common to 36.
The common factors of 36 and 81 are: 1, 3, and 9
The common factors of 4 and 36 are 1, 2, and 4