We look at the division of 871236 by 81 
The aim is to understand the frequency of 81 in 871236.

Step 1:
When dividing 8 by 81, we get 0 with a remainder of 8.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 8, we get 8.
Include the next digit (7) from the dividend after 8, then repeat: 87 / 81

Let's proceed to step 2:
When dividing 87 by 81, we get 1 with a remainder of 6.
Put 1 as the next digit of the answer. 
Result so far: 1.0
The remainder is 6 after subtracting 81 from 87.
Take the next digit (1) from the dividend and append it to 6, then repeat: 61 / 81

Going ahead to step 3:
81 can be fit into 61 0 times, resulting in a remainder of 61.
Record the quotient 0 as the next digit in the result. 
Result so far: 10.0
Subtracting 0 from 61 leaves us with 61.
Take the next digit (2) from the dividend and append it to 61, then repeat: 612 / 81

On to step 4:
81 goes into 612 7 times with a remainder of 45.
The number 7 becomes the next digit in our result. 
Result so far: 107.0
Subtracting 567 from 612 leaves us with 45.
Take the next digit (3) from the dividend and append it to 45, then repeat: 453 / 81

On to step 5:
If we divide 453 by 81, we get 5 and a remainder of 48.
Put 5 as the next digit of the answer. 
Result so far: 1075.0
Deduct 405 from 453 and we're left with 48.
Include the next digit (6) from the dividend after 48, then repeat: 486 / 81

On to step 6:
When dividing 486 by 81, we get 6 with a remainder of 0.
Record the quotient 6 as the next digit in the result. 
Result so far: 10756.0
Subtracting 486 from 486 leaves us with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Step 7:
0 divided by 81 is 0 with a remainder of 0.
The next digit of our result is 0. 
Result so far: 10756.0
If we take 0 away from 0, we end up with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

On to step 8:
The number 81 fits into 0 0 times, leaving a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 10756.0
Subtracting 0 from 0 leaves us with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

In conclusion, the division gives 10756.0 with a balance of 0.0.