We look at the division of 961757 by 81 
The aim is to understand the frequency of 81 in 961757.

Let's proceed to step 1:
The number 81 fits into 9 0 times, leaving a remainder of 9.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 9, we get 9.
Include the next digit (6) from the dividend after 9, then repeat: 96 / 81

Moving on to step 2:
The number 81 fits into 96 1 times, leaving a remainder of 15.
Use 1 as the next digit of our solution. 
Result so far: 1.0
Subtract 81 from 96 to get 15.
Grab the next digit (1) from the dividend, add it to 15, then carry on: 151 / 81

Moving on to step 3:
The number 81 fits into 151 1 times, leaving a remainder of 70.
The next digit of our result is 1. 
Result so far: 11.0
The remainder is 70 after subtracting 81 from 151.
Take the next digit (7) from the dividend and append it to 70, then repeat: 707 / 81

Moving on to step 4:
81 goes into 707 8 times with a remainder of 59.
Put 8 as the next digit of the answer. 
Result so far: 118.0
Subtract 648 from 707 to get 59.
Grab the next digit (5) from the dividend, add it to 59, then carry on: 595 / 81

Step 5:
81 goes into 595 7 times with a remainder of 28.
The number 7 becomes the next digit in our result. 
Result so far: 1187.0
Subtract 567 from 595 to get 28.
Append the next digit (7) from the dividend to 28 and continue with: 287 / 81

On to step 6:
The number 81 fits into 287 3 times, leaving a remainder of 44.
Put 3 as the next digit of the answer. 
Result so far: 11873.0
If we take 243 away from 287, we end up with 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 7:
81 can be fit into 440 5 times, resulting in a remainder of 35.
The next digit of our result is 5. 
Result so far: 11873.5
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.

Advancing to step 8:
If we divide 350 by 81, we get 4 and a remainder of 26.
Record the quotient 4 as the next digit in the result. 
Result so far: 11873.54
The remainder is 26 after subtracting 324 from 350.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

Step 9:
260 divided by 81 is 3 with a remainder of 17.
Use 3 as the next digit of our solution. 
Result so far: 11873.543
If we subtract 243 from 260, we get 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Going ahead to step 10:
The number 81 fits into 170 2 times, leaving a remainder of 8.
Put 2 as the next digit of the answer. 
Result so far: 11873.5432
The remainder is 8 after subtracting 162 from 170.
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 11:
80 divided by 81 is 0 with a remainder of 80.
The number 0 becomes the next digit in our result. 
Result so far: 11873.5432
Subtract 0 from 80 to get 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

Advancing to step 12:
The number 81 fits into 800 9 times, leaving a remainder of 71.
The number 9 becomes the next digit in our result. 
Result so far: 11873.543209
If we take 729 away from 800, we end up with 71.
Since there are no more digits in the dividend, we add a zero to the remainder making it 710, and continue the process.

Advancing to step 13:
The number 81 fits into 710 8 times, leaving a remainder of 62.
The next digit of our result is 8. 
Result so far: 11873.5432098
Deduct 648 from 710 and we're left with 62.
Since there are no more digits in the dividend, we add a zero to the remainder making it 620, and continue the process.

Going ahead to step 14:
The number 81 fits into 620 7 times, leaving a remainder of 53.
Record the quotient 7 as the next digit in the result. 
Result so far: 11873.54320987
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.

In conclusion, the division gives 11873.54320987 with a balance of 5.3e-08.