81
27,3
9,3,3
3,3,3,3
9x9=81. Proving that one of the factor trees for 81 is 9xp.
Ah, finding the greatest common factor is like finding a happy little tree in a forest. For 36 and 81, we look for the largest number that can divide evenly into both. The greatest common factor for 36 and 81 is 9, like a gentle breeze on a sunny day.
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
3,3,3,39,3,327,381
The factors of 81 are: 1, 3, 9, 27, 81.
81 27,3 9,3,3 3,3,3,3
648 162 4 81 2 2 2 9 9 Equals: 9 squared time 2 cubed.
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.