27
3,9
3,3,3
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15,3 3,5,3
The factors of 81 are: 1, 3, 9, 27, 81.
9x9=81. Proving that one of the factor trees for 81 is 9xp.
27 9,3 3,3,3 36 18,2 9,2,2 3,3,2,2 The GCF is 3 x 3, or 9.
I can't make the actual lines, but there's a factor tree. 104 2 * 52 2 * 26 2 * 13 2*2*2*13=104