The factors of 45 are:
1, 3, 5, 9, 15, 45
The factors of 81 are:
1, 3, 9, 27, 81
The common factors are:
1, 3, 9
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The highest common factor of 81 and 63 is 9
The GCF is 9.
Use the following factor trees to determine the answer355, 7and637, 97, 3, 37 is the common factor of 35 and 63
The greatest common factor of 56 and 81 is 1.
The GCF of 53 and 81 is 1.