We divide 872863 by 81
The aim is to understand the frequency of 81 in 872863.

On to step 1:
If we divide 8 by 81, we get 0 and a remainder of 8.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 8 and we're left with 8.
Append the next digit (7) from the dividend to 8 and continue with: 87 / 81

Going ahead to step 2:
When dividing 87 by 81, we get 1 with a remainder of 6.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
The remainder is 6 after subtracting 81 from 87.
Take the next digit (2) from the dividend and append it to 6, then repeat: 62 / 81

Let's proceed to step 3:
If we divide 62 by 81, we get 0 and a remainder of 62.
Write down 0 as next digit of the result. 
Result so far: 10.0
Subtracting 0 from 62 leaves us with 62.
Include the next digit (8) from the dividend after 62, then repeat: 628 / 81

Advancing to step 4:
If we divide 628 by 81, we get 7 and a remainder of 61.
Write down 7 as next digit of the result. 
Result so far: 107.0
If we subtract 567 from 628, we get 61.
Include the next digit (6) from the dividend after 61, then repeat: 616 / 81

Step 5:
616 divided by 81 is 7 with a remainder of 49.
The next digit of our result is 7. 
Result so far: 1077.0
Subtracting 567 from 616 leaves us with 49.
Grab the next digit (3) from the dividend, add it to 49, then carry on: 493 / 81

Going ahead to step 6:
81 goes into 493 6 times with a remainder of 7.
Write down 6 as next digit of the result. 
Result so far: 10776.0
The remainder is 7 after subtracting 486 from 493.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Let's proceed to step 7:
70 divided by 81 is 0 with a remainder of 70.
Put 0 as the next digit of the answer. 
Result so far: 10776.0
If we take 0 away from 70, we end up with 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

On to step 8:
81 goes into 700 8 times with a remainder of 52.
The next digit of our result is 8. 
Result so far: 10776.08
Subtract 648 from 700 to get 52.
Since there are no more digits in the dividend, we add a zero to the remainder making it 520, and continue the process.

On to step 9:
520 divided by 81 is 6 with a remainder of 34.
Put 6 as the next digit of the answer. 
Result so far: 10776.086
If we subtract 486 from 520, we get 34.
Since there are no more digits in the dividend, we add a zero to the remainder making it 340, and continue the process.

Let's proceed to step 10:
340 divided by 81 is 4 with a remainder of 16.
Put 4 as the next digit of the answer. 
Result so far: 10776.0864
Subtract 324 from 340 to get 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

On to step 11:
When dividing 160 by 81, we get 1 with a remainder of 79.
Put 1 as the next digit of the answer. 
Result so far: 10776.08641
The remainder is 79 after subtracting 81 from 160.
Since there are no more digits in the dividend, we add a zero to the remainder making it 790, and continue the process.

Moving on to step 12:
81 can be fit into 790 9 times, resulting in a remainder of 61.
Put 9 as the next digit of the answer. 
Result so far: 10776.086419
If we subtract 729 from 790, we get 61.
Since there are no more digits in the dividend, we add a zero to the remainder making it 610, and continue the process.

Let's proceed to step 13:
81 goes into 610 7 times with a remainder of 43.
Put 7 as the next digit of the answer. 
Result so far: 10776.0864197
Subtract 567 from 610 to get 43.
Since there are no more digits in the dividend, we add a zero to the remainder making it 430, and continue the process.

On to step 14:
When dividing 430 by 81, we get 5 with a remainder of 25.
Write down 5 as next digit of the result. 
Result so far: 10776.08641975
Subtract 405 from 430 to get 25.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

The final result is 10776.08641975 with a remainder of 2.5e-08.