1 x 81, 3 x 27, 9 x 9, 27 x 3, 81 x 1
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Factors of 81 in pairs = 1 x 81, 3 x 27, 9 x 9, 27 x 3, 81 x 1.
Since 81 is not divisible by 7 therefore, 7 is not a factor of 81.
No, 18 is not a factor of 81.
Nine is the highest common factor of 81 and 9
The GCF of 53 and 81 is 1.