We look at the division of 889775 by 81 
The aim is to understand the frequency of 81 in 889775.

Step 1:
81 can be fit into 8 0 times, resulting in 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.
Bring next digit (8) of the dividend behind the 8 and repeat the process: 88 / 81

Advancing to step 2:
If we divide 88 by 81, we get 1 and a remainder of 7.
The next digit of our result is 1. 
Result so far: 1.0
Subtract 81 from 88 to get 7.
Include the next digit (9) from the dividend after 7, then repeat: 79 / 81

Going ahead to step 3:
79 divided by 81 is 0 with a remainder of 79.
The next digit of our result is 0. 
Result so far: 10.0
The remainder is 79 after subtracting 0 from 79.
Include the next digit (7) from the dividend after 79, then repeat: 797 / 81

On to step 4:
The number 81 fits into 797 9 times, leaving a remainder of 68.
Record the quotient 9 as the next digit in the result. 
Result so far: 109.0
If we take 729 away from 797, we end up with 68.
Bring next digit (7) of the dividend behind the 68 and repeat the process: 687 / 81

Advancing to step 5:
81 goes into 687 8 times with a remainder of 39.
Record the quotient 8 as the next digit in the result. 
Result so far: 1098.0
The remainder is 39 after subtracting 648 from 687.
Append the next digit (5) from the dividend to 39 and continue with: 395 / 81

Moving on to step 6:
When dividing 395 by 81, we get 4 with a remainder of 71.
The next digit of our result is 4. 
Result so far: 10984.0
If we subtract 324 from 395, we get 71.
Since there are no more digits in the dividend, we add a zero to the remainder making it 710, and continue the process.

Going ahead to step 7:
The number 81 fits into 710 8 times, leaving a remainder of 62.
Record the quotient 8 as the next digit in the result. 
Result so far: 10984.8
If we subtract 648 from 710, we get 62.
Since there are no more digits in the dividend, we add a zero to the remainder making it 620, and continue the process.

Advancing to step 8:
620 divided by 81 is 7 with a remainder of 53.
The next digit of our result is 7. 
Result so far: 10984.87
Subtract 567 from 620 to get 53.
Since there are no more digits in the dividend, we add a zero to the remainder making it 530, and continue the process.

Going ahead to step 9:
81 goes into 530 6 times with a remainder of 44.
The next digit of our result is 6. 
Result so far: 10984.876
Subtract 486 from 530 to get 44.
Since there are no more digits in the dividend, we add a zero to the remainder making it 440, and continue the process.

Let's proceed to step 10:
81 goes into 440 5 times with a remainder of 35.
Put 5 as the next digit of the answer. 
Result so far: 10984.8765
Deduct 405 from 440 and we're left with 35.
Since there are no more digits in the dividend, we add a zero to the remainder making it 350, and continue the process.

Step 11:
81 can be fit into 350 4 times, resulting in a remainder of 26.
Record the quotient 4 as the next digit in the result. 
Result so far: 10984.87654
Deduct 324 from 350 and we're left with 26.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

Moving on to step 12:
81 can be fit into 260 3 times, resulting in a remainder of 17.
Use 3 as the next digit of our solution. 
Result so far: 10984.876543
If we take 243 away from 260, we end up with 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

On to step 13:
The number 81 fits into 170 2 times, leaving a remainder of 8.
Use 2 as the next digit of our solution. 
Result so far: 10984.8765432
Subtracting 162 from 170 leaves us with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Moving on to step 14:
81 can be fit into 80 0 times, resulting in a remainder of 80.
Put 0 as the next digit of the answer. 
Result so far: 10984.8765432
The remainder is 80 after subtracting 0 from 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

After the division, we end up with 10984.8765432 and a remainder of 8e-08.