9x9=81. Proving that one of the factor trees for 81 is 9xp.
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The factors of 81 are: 1, 3, 9, 27, 81.
19 is not a factor of 81. Factors of 81 are 1, 3, 9, 27, and 81
The greatest common factor of 52 and 81 is 1
15,3 3,5,3
27 3,9 3,3,3