81
27,3
9,3,3
3,3,3,3
81
9,9
3,3,9
3,3,3,3
9x9=81. Proving that one of the factor trees for 81 is 9xp.
81 27,3 9,3,3 3,3,3,3
yes
1,2,3,4,6,8,9,12,18,24,36,72 factor of 72 1,3,9,27,and 81 is factor of 81
1,81,3,27,9
It can be. 81 is a factor of 162.
The common factors of 27 and 81 are: 1, 3, 9, and 27
(1, 81) (3, 27) (9, 9)
The factors of 64 are all 2s and the factors of 81 are all 3s. The greatest common factor is 1, since they have no factors in common. ■
19 is not a factor of 81. Factors of 81 are 1, 3, 9, 27, and 81
Since 9 is a factor of 81, all of its factors are common.
Since 81 is not divisible by 7 therefore, 7 is not a factor of 81.