All are divisible by 9. (and by 3)
54 = 6 x 9
36 = 4 x 9
81 = 9 x 9
gcf(81, 36) = 9 gcf(27, 54) = 27 gcf(81, 36, 27, 54) = 9
9, 18, 27, 36, 45, 54, 63, 72, 81, 90, 99...
Numbers that are divisible by 9 are multiples of nine. 9, 18, 27, 36, 45, 54, 63, 72, 81, 90, 99 etc... Any other numbers are "not" divisible by 9.
Here are all of them: 18, 27, 36, 45, 54, 63, 72, 81, 90 and 99.
9
1, 2, 3, 4, 6, 9, 12, 18, 27, 36, 54, 81, 108, 162, 324
No, 18 is not a factor of 81.
It is 9
972 is divisible by: 1 2 3 4 6 9 12 18 27 36 54 81 108 162 243 324 486 and 972.
The factors of 36 are: 1, 2, 3, 4, 6, 9, 12, 18, 36 The factors of 54 are: 1, 2, 3, 6, 9, 18, 27, 54 The factors of 81 are: 1, 3, 9, 27, 81
its divisible by two
all multiples of 9 i.e 9, 18, 27, 36, 45, 54, 63, 72, 81, 90, 99