Q: Is 81 divisible by 3 or 9?

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1, 3, 9, 27, 81

Yes. Test a couple numbers divisible by 9--27, 81--and they are all divisible by 3.

A number is divisible by 9 if all the digits add up to 9 or are a factor of. IF the digits add up to 9 (or a factor of 9), they will automatically be a factor of 3.Yes. Test a couple numbers divisible by 9--27, 81--and they are all divisible by 3.

81: 8 + 1 = 9 which is divisible by 9, so 81 is divisible by 9 162: 1 + 6 + 2 = 9 which is divisible by 9, so 162 is divisible by 9 199: 1 + 9 + 9 = 19 → 1 + 9 = 10 → 1 + 0 = 1 which is not divisible by 9, so 199 is not divisible by 9. 1125: 1 + 1 + 2 + 5 = 9 which is divisible by 9, so 1125 is divisible by 9. So 199 is the only one not divisible by 9.

No - 3/81 = 0.037 recurring (that is, 0.037037037...)

Related questions

81 is divisible by 1, 3, 9, 27 and 81

"What is divisible by 81?" Any multiple of 81 is divisible by 81. For example, all of the following are divisible by 81: 81 = 1 x 81 162 = 2 x 81 243 = 3 x 81 324 = 4 x 81 and so on. ========================================= Did you mean to ask "What is 81 divisible by?" 81 is divisible by 1, 3, 9, 27, 81.

They're not. 81 is divisible by 1, 3, 9, 27, and 81. Those are called the "factors" of 81, because each of them divides evenly into 81 with no remainder.

1, 3, 9, 27, 81

All are divisible by 9. (and by 3) 54 = 6 x 9 36 = 4 x 9 81 = 9 x 9

Yes. Test a couple numbers divisible by 9--27, 81--and they are all divisible by 3.

Everything's divisible. 243 is divisible by 1, 3, 9, 27, 81 and 243.

9 x 9 = 81

1, 3, 9, 27, 81 and 243.

A number is divisible by 9 if all the digits add up to 9 or are a factor of. IF the digits add up to 9 (or a factor of 9), they will automatically be a factor of 3.Yes. Test a couple numbers divisible by 9--27, 81--and they are all divisible by 3.

Yes, 405 is divisible by 1, 3 , 5, 9 , 15, 27, 45, 81, 135, 405.

21789 is divisible by 1, 3, 9, 27, 81, 269, 807, 2421, 7263, 21789