Factors of 81 in pairs = 1 x 81, 3 x 27, 9 x 9, 27 x 3, 81 x 1.
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Factors are just numbers 81 can be divided by. The whole number factors are 1, 3, 9, 27, and 81
81
9 squared is 81. Two digits lower than 81 is 79. 79 is a prime number. Its only factors are one and itself. That does not compute. 78 has 26 and 6 as factors. 78 is three digits lower than 81. That does not compute.
Factors refer to whole numbers. The square root of 820 is not a whole number.
The factors of 81 are 1, 3, 9, 27, 81. For them to be common, they need to be compared to another set of factors.