9x9=81. Proving that one of the factor trees for 81 is 9xp.
The factors of 81 are: 1, 3, 9, 27, 81.
You cannot really make a factor tree for 7 because it is already a prime number.
19 is not a factor of 81. Factors of 81 are 1, 3, 9, 27, and 81
15,3 3,5,3
The greatest common factor of 52 and 81 is 1
81 27,3 9,3,3 3,3,3,3
81 27,3 9,3,3 3,3,3,3
81 27,3 9,3,3 3,3,3,3
81 27,3 9,3,3 3,3,3,3
81 27,3 9,3,3 3,3,3,3
The factors of 81 are: 1, 3, 9, 27, 81.
81 27,3 9,3,3 3,3,3,3
81 27,3 9,3,3 3,3,3,3
81 9, 9 3, 3, 3, 3
81 27,3 9,3,3 3,3,3,3
45 15,3 5,3,3 81 27,3 9,3,3 3,3,3,3
51 3,17 81 9,9 3,3,9 3,3,3,3 The GCF is 3.