19 is not a factor of 81. Factors of 81 are 1, 3, 9, 27, and 81
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9x9=81. Proving that one of the factor trees for 81 is 9xp.
100 - 19 = 81.
The greatest common factor of 52 and 81 is 1
81
The factors of 81 are: 1, 3, 9, 27, 81.