The highest common factor of 81 and 63 is 9
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The GCF is 9.
The factors of 56 are: 1, 2, 4, 7, 8, 14, 28, 56 The factors of 63 are: 1, 3, 7, 9, 21, 63 The factors of 81 are: 1, 3, 9, 27, 81
The GCF is 9.63/81 = 7/9
a. 63
The LCM of 27 and 63 is 189. The LCM of 81 and 441 is 3969. The LCM of all four is 3969.