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Home > Pre-Algebra calculators > Divisibility rule example
Divisibility rule of 81 example ( Enter your problem )
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80. Divisibility rule of 80 example
(Previous example)		82. Divisibility rule of 82 example
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81. Divisibility rule of 81 example


1. Check whether 23328 is divisible by 81 or not?

Solution:
Divisibility rule of 81 :
8 times the last digit and subtract it from the rest of the number.
If the answer is divisible by 81, then number is also divisible by 81.
(Apply this rule to the answer again if necessary)

`2332color{red}{8}=>2332 - color{red}{8} xx 8 = 2332 -64 = 2268`

`226color{red}{8}=>226 - color{red}{8} xx 8 = 226 -64 = 162`

`16color{red}{2}=>16 - color{red}{2} xx 8 = 16 -16 = 0`

Here 0 is divisible by 81.
`:.` 23328 is divisible by 81.


2. Check whether 24624 is divisible by 81 or not?

Solution:
Divisibility rule of 81 :
8 times the last digit and subtract it from the rest of the number.
If the answer is divisible by 81, then number is also divisible by 81.
(Apply this rule to the answer again if necessary)

`2462color{red}{4}=>2462 - color{red}{4} xx 8 = 2462 -32 = 2430`

`243color{red}{0}=>243 - color{red}{0} xx 8 = 243 = 243`

`24color{red}{3}=>24 - color{red}{3} xx 8 = 24 -24 = 0`

Here 0 is divisible by 81.
`:.` 24624 is divisible by 81.


3. Check whether 31833 is divisible by 81 or not?

Solution:
Divisibility rule of 81 :
8 times the last digit and subtract it from the rest of the number.
If the answer is divisible by 81, then number is also divisible by 81.
(Apply this rule to the answer again if necessary)

`3183color{red}{3}=>3183 - color{red}{3} xx 8 = 3183 -24 = 3159`

`315color{red}{9}=>315 - color{red}{9} xx 8 = 315 -72 = 243`

`24color{red}{3}=>24 - color{red}{3} xx 8 = 24 -24 = 0`

Here 0 is divisible by 81.
`:.` 31833 is divisible by 81.


4. Check whether 22357 is divisible by 81 or not?

Solution:
Divisibility rule of 81 :
8 times the last digit and subtract it from the rest of the number.
If the answer is divisible by 81, then number is also divisible by 81.
(Apply this rule to the answer again if necessary)

`2235color{red}{7}=>2235 - color{red}{7} xx 8 = 2235 -56 = 2179`

`217color{red}{9}=>217 - color{red}{9} xx 8 = 217 -72 = 145`

`14color{red}{5}=>14 - color{red}{5} xx 8 = 14 -40 = -26`

Here -26 is not divisible by 81.
`:.` 22357 is not divisible by 81.


5. Check whether 24956 is divisible by 81 or not?

Solution:
Divisibility rule of 81 :
8 times the last digit and subtract it from the rest of the number.
If the answer is divisible by 81, then number is also divisible by 81.
(Apply this rule to the answer again if necessary)

`2495color{red}{6}=>2495 - color{red}{6} xx 8 = 2495 -48 = 2447`

`244color{red}{7}=>244 - color{red}{7} xx 8 = 244 -56 = 188`

`18color{red}{8}=>18 - color{red}{8} xx 8 = 18 -64 = -46`

Here -46 is not divisible by 81.
`:.` 24956 is not divisible by 81.


6. Check whether 30746 is divisible by 81 or not?

Solution:
Divisibility rule of 81 :
8 times the last digit and subtract it from the rest of the number.
If the answer is divisible by 81, then number is also divisible by 81.
(Apply this rule to the answer again if necessary)

`3074color{red}{6}=>3074 - color{red}{6} xx 8 = 3074 -48 = 3026`

`302color{red}{6}=>302 - color{red}{6} xx 8 = 302 -48 = 254`

`25color{red}{4}=>25 - color{red}{4} xx 8 = 25 -32 = -7`

Here -7 is not divisible by 81.
`:.` 30746 is not divisible by 81.




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80. Divisibility rule of 80 example
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